2022版高考英语（译林版）一轮复习学案： 必修1 unit 2 growing pains Word版含答案

这是一份2022版高考英语（译林版）一轮复习学案： 必修1 unit 2 growing pains Word版含答案，共17页。

[单词 拼写应用]
核心单词
1．frbid vt.禁止
2．handle vt.处理；应付
3．tend vi.往往；趋向 vt.照看
4．insist vi.坚持，坚持认为
5．scene n．(戏剧的)一场；场面；景色
6．deserve vt.值得；应得；应受
7．annyed adj.愤怒的，生气的
8．misunderstand vt.误解
9．upset adj.不高兴的，失望的 vt.使不高兴，使失望
10．last vi.持久vt.持续，维持(一段时间)
[语境运用] 用所给词的适当形式填空
1．(2019·浙江卷) If praise is sincere and fcused n the effrt nt the utcme，yu can give it as ften as yur child des smething that deserves (deserve) a verbal reward.
2．(2019·江苏卷) The task was s hard，and Steve，angry and upset (upset)，said he was quitting.
3．(2018·全国卷Ⅱ)Exercising makes yu mre awake and ready t_handle(handle) whatever is ahead f yu fr the day.
4．(2017·全国卷Ⅲ)This attractive tur takes yu t sme f San Francisc's mst cheerful hliday scenes (scene)．
5．In my pinin，smking shuld be_frbidden(frbid) in public places.
6．My grandmther tends(tend) t g t bed early every day.
7．“I shuld”，she insisted (insist)，“need an extra­thick sleeping bag when I sleep utside.”
拓展单词
1．limit n．限制；极限；界限 vt.限制→limited adj.有限的
2．starve vi.挨饿；饿死 vt.使挨饿→starvatin n．饿死
3．distant adj.不友好的，冷淡的，疏远的；遥远的→distance n．距离；远处；疏远
4．harm vt.& n．伤害→harmful adj.伤害的，有害的→harmless adj.无害的
5．tlerate vt.容忍；允许→tlerance n．容忍；允许→tlerant adj.宽容的，容忍的
6．defend vt.辩解，辩白；防御，保护→defence/defense n．防御，答辩，防护
7．cnfuse vt.使困惑，混淆，混乱→cnfused adj.困惑的，不解的→cnfusing adj.令人困惑的→cnfusin n．困惑，糊涂；混淆；混乱
8．frighten vt.使惊吓，使害怕→frightened adj.受惊的；害怕的→frightening adj.令人恐惧的，令人害怕的
[语境运用] 用所给词的适当形式填空
1．Mary was t frightened t see the frightening scene.(frighten)
2．The cnfusing prblem really cnfuses the cnfused by，wh is always cnfused abut such things.(cnfuse)
3．David defended his idea that each f us shuld refuse t buy freign prducts in defence/defense f ur natinal industry.(defend)
4．It is surprising that there are still many peple in the wrld starving t death each year; that is，many peple die f starvatin.(starve)
5．I will nt tlerate that srt f behavir in my class and，what's mre，n ne will be tlerant f that.(tlerate)
6．While the experts agree that this kind f fd is harmless，it will be harmful t the teenagers if they eat it t much frequently.(harm)
7．The Latin American，n the ther hand，ften cnsiders the Nrth American t be “cld” r “distant” because he keeps a great distance between himself and the persn he is speaking t.(distant)
阅读单词
1．curtain n．窗帘；(舞台上的)幕布
2．garbage n．〈美〉(生活)垃圾
3．nrmal n．& adj.正常(的)，一般(的)
4．teenager n．(13－19岁的)青少年
5．argument n．争吵，辩论；论点，论据
6．behavir n．行为，举止
7．emergency n．突发事件；紧急情况
8．clinic n．诊所
9．adlescence n．青春期
1．(2019·全国卷Ⅱ)“Yu can use me as a last resrt(选择)，and if nbdy else vlunteers，then I will d it.”adj. 最不适当的；最不可能的
2．(2019·浙江卷)They became the httest thing n the pp music scene in England.n.界；活动领域
[短语 多维应用]
[句式 结构仿写]
1．scene n．(戏剧的)一场；场面；景色
n the scene(＝n the spt) 在现场
behind the scenes 在后台，在幕后；暗中
appear/cme n the scene出场；登场
learn what ges n behind the scenes了解幕后的工作
appear/cme n the scene n time准时登场
be n the scene in minutes几分钟就赶到现场
[基础练习]——写出下列句中scene的含义
①(2017·全国卷Ⅲ)It was a scene that had been repeated many times in the theater's 75­year histry.(戏剧的)一场
②There were funny scenes when the pig ran int the shp.场面
③The dctr was n the scene very quickly after the accident.现场
④The bats in the harbur make a beautiful scene.景色
[能力提升]——一句多译
交通事故发生后，警察立即赶到了现场。
①After the traffic accident happened，the plice were n_the_spt at nce.(spt)
②After the traffic accident happened，the plice were n_the_scene at nce.(scene)
[名师点津] scene有“场景；场面；地点”的含义，后接定语从句，且关系词在从句中作状语时，一般用关系副词where或in which来引导。
On receiving the call，the plice rushed t the scene，where/in which the traffic accident happened.
接到电话，警察匆忙赶到交通事故现场。
2．upset adj.不高兴的，失望的 vt.使不高兴，使失望
(1)get/be upset abut/at/ver sth.为某事烦心
be upset t d sth.因做某事感到沮丧
be upset that...为……烦心
(2)upset neself abut sth.某人为某事自寻烦恼
It upsets sb.t d sth./that...让某人烦心的是……
be upset at nt being welcmed因不受人欢迎而生气
upset a glass f milk弄翻一杯牛奶
upset smene's plan 搅乱某人的计划
[基础练习]——单句语法填空
①In my pinin，there is n pint being upset abut/at/ver it.
②She was upset t_knw(knw) that her applicatin fr the psitin was refused.
[能力提升]——句式升级
(普通表达) She was upset that he had left withut saying gdbye.
①(高级表达) It upset_her_that he had left withut saying gdbye.
②(高级表达) What upset_her/made_her_upset was that he had left withut saying gdbye.
[名师点津] upset作形容词时为表语形容词，不能作定语；upset的过去式和过去分词形式仍为upset；upset的现在分词形式为upsetting。
3．deserve vt.值得；应得；应受
deserve t d sth.(某人)值得做某事
deserve ding/t be dne (某事)值得被做
deserve cnsideratin/attentin 值得考虑/关注
deserve a reward fr her hard wrk她工作努力应该得到奖励
deserve punishment/punishing/t be punished应受惩罚
get what he deserves得到他应得的；罪有应得
[基础练习]——单句语法填空
They had sme excellent players，s they certainly deserved t_win (win) that match.
[能力提升]——句式升级
(普通表达) What cmes first is t keep an pen mind，because everyne's ideas deserve cnsideratin.
(高级表达) What cmes first is t keep an pen mind，because everyne's ideas deserve cnsidering/t_be_cnsidered.
[名师点津] 当物作主语时，deserve后接ding，是主动形式表示被动意义，等于接动词不定式的被动式。有相同用法的动词还有表示“需要”的need，want和require。
4．insist vi.坚持；坚持认为
insist n (ding) sth.坚持(做)某事
insist that...坚持认为……，坚决要求……
insist n a definite answer坚决要求一个肯定的答复
insist n speaking t yu persnally坚持要和你本人谈
insist (that) he is inncent坚持认为他无罪
[基础练习]——单句语法填空
①The man insisted n finding(find) a taxi fr me even thugh I tld him I lived nearby.
②The dctr insisted that she was(be) seriusly ill and that she (shuld)_be_ perated(perate) n immediately.
[能力提升]——句式升级
(普通表达)He insisted n making an aplgy t his teacher fr his rudeness.
(高级表达)He insisted that he_(shuld)_make_an_aplgy_t his teacher fr his rudeness.
[名师点津] ①下列动词后的宾语从句用虚拟语气“(shuld) d”：
一坚持(insist)，二命令(rder，cmmand)，三建议(advise，suggest，prpse)，四要求(demand，require，request，ask)，外加一个敦促(urge)。
②insist不表示“坚决要求”，suggest不表示“建议”，后面的从句用陈述语气。
5．harm vt.& n．伤害
(1)cause harm t...对……造成伤害/有害
harm sb.(＝d harm t sb.＝d sb.harm) 伤害某人
There is n harm in ding sth.做某事没有害处
mean n harm t...对……没有恶意
(2)be harmful t...对……有害
the harm dne t the envirnment 对环境造成的损害
d mre harm than gd成事不足，败事有余
mean n harm t her对她并无恶意
[基础练习]——单句语法填空
①I meant n harm t yu — nly t keep yu frm failing.
②If we knw that gssip(闲话) can be harmful (harm)，then why d s many f us d it?
③There is n harm in writing(write) dwn yur name n the frm.
[能力提升]——一句多译
如果使用不当，这种药物会对你造成伤害。
①If used imprperly，the medicine will d/cause_harm_t_yu/d _yu_harm. (harm n．)
②If used imprperly，the medicine will harm_yu.(harm vt.)
③If used imprperly，the medicine will be_harmful_t_yu. (harmful)
6．frbid vt.禁止
(1)frbid ding sth.禁止做某事
frbid sb.t d sth.(＝frbid sb.frm ding sth.) 禁止某人做某事
(2)frbidden adj.被禁止的；严禁的
It's frbidden t d sth.做某事是禁止的
frbid smking and drinking禁止抽烟、喝酒
frbid sb.(t eat) sugar 禁止某人吃糖
be frbidden frm leaving the cuntry被禁止出境
[基础练习]——单句语法填空
①The schl frbids smking (smke) in the ffice.
②It's frbidden(frbid) fr us t play n the lawn belnging t him.
[能力提升]——一句多译
家长应该禁止孩子们长时间在家里玩电脑游戏。
①Parents shuld frbid their children t_play cmputer games fr a lng time at hme.(不定式)
②Parents shuld frbid their children frm_playing cmputer games fr a lng time at hme.(动名词)
7．tend vi.往往；趋向 vt.照看
(1)tend t d sth.倾向于做某事；易于做某事
tend (t)．..照看/护理……
tend t/twards sth.倾向于某事物
(2)tendency n．倾向，趋势
have a tendency t d sth.有做某事的倾向
tend her little garden照料她的小花园
tend t g t bed early every day每天通常早睡
tending twards the view that all students shuld study English倾向于认为所有的学生都应该学习英语
[基础练习]——单句语法填空
Dctrs are tending t the wunded nw.
[能力提升]——一句多译
如果我不听从妈妈的建议，她就会生气。
①My mther will tend_t_get_angry if I dn't fllw her advice.(tend)
②My mther will have_a_tendency_t_get_angry if I dn't fllw her advice.(tendency)
8．limit n．限制；极限；界限 vt.限制
(1)set a limit t 限制，控制
withut limit无限制地
there is a/n limit t 对……是有限的/无限的
(2)把……限制在……
be limited t ...受限制于……
(3)limited adj.有限的
limitless adj.无限制的
push me t the limit f my abilities逼着我把能力发挥到极限
reach the limit f ne's patience达到了忍无可忍的地步
limit the expense t 1,000 dllars把开支限制到1 000美元
be limited t fifteen passengers只限15 名乘客
[基础练习]——单句语法填空
①We must limit the expenses t what we can affrd.
②Our life has a limit，but knwledge is limitless.(limit)
③The cuple set a limit t the expense f the trip fr their daughter.
④In a knwledge era，lifelng learning is nt limited(limit) t a traditinal classrm.
[能力提升]——完成句子
一个人的生命是有限的，但是为人民服务是无限的。
There is a_limit_t ne's life，but n_limit_t_serving the peple.
9．be suppsed t 应该……，应当……
(1)be suppsed t d sth.应该做某事
be suppsed t have dne sth.本应该做某事(实际未做)
be suppsed t be...被认为是……
(2)suppsing (that)．..假定/假如……
be suppsed t be here at abut fur应该在4点左右到达这里
be suppsed t be a really gd pem被认为是一首真正的好诗
be nt suppsed t have given up that match本不应该放弃那场比赛
[基础练习]——单句语法填空
①Students are_suppsed (suppse) t bey the rules at schl.
②The man (wh was) suppsed t_be (be) a beggar by the public was really a plice fficer in disguise.
③Suppsing(suppse) that there was an earthquake，what wuld be the right way t escape?
[能力提升]——词汇升级
(普通表达)Yu shuld have handed in yur hmewrk yesterday.
(高级表达)Yu are_suppsed_t_have_handed_in yur hmewrk yesterday. (suppse)
10．stay up不睡觉，熬夜
stay at hme 待在家中
stay behind 留下来
stay away (frm) 躲避；不接近(某人)
stay awake 不睡觉
stay up late t finish the hmewrk熬夜到很晚把功课做完
stay away frm the meeting回避会议
stay behind after class课后留下来
[基础练习]——单句语法填空
①Like mst mthers，she stayed at hme while her children were yung.
②T lse weight，yu shuld stay away frm rich fd.
③Culd yu please stay behind after thers have gne and help me clear up?
[能力提升]——一句多译
母亲彻夜不眠守候着那生病的孩子。
①The mther sat_up all night with the sick child.(sit)
②The mther stayed_up/awake all night with the sick child.(stay)
11．mix up混淆，弄乱；搅匀，拌和
mix up with分不清；与(某人)混在一起
把……和……混合
mix with sth.与某物相融合
mix up flur and water把面粉和水搅匀
feel very mixed up abut life对于人生感到非常迷惑
mix wrk with adequate rest劳逸结合
[基础练习]——单句语法填空
①This kind f paint mixes easily with water.
②Yu're always mixing me up with my twin brther.
③The pstman was_mixed(mix) up，s he delivered the package t the wrng huse.
[能力提升]——完成句子
他的解释不但没帮她的忙，反而把她搞糊涂了。
Instead f helping her，his explanatin nly mixed_her_up.
12．(教材P23) Daniel has_his_arms_crssed and lks upset.丹尼尔双臂抱在胸前，看起来很不高兴
(1)“have sth.dne”的两种含义：
①(主语)让别人做某事，相当于get sth.dne
②(主语)遭遇到某种不幸
(2)have sb.d sth.让某人做某事
have sb.ding sth.让某人一直做某事
can't/wn't have sb.ding sth.不能容忍/允许某人做某事
(3)(sb.) have sth.t d (某人)有某事要做 (主语自己做)
[金句推送](2019·江苏卷·写作佳句) Secndly，the incnvenience is nt a prblem if ur purpse is t have Chinese culture shared.
其次，如果我们的目的是分享中国文化，那么不方便就不是问题了。
[基础练习]——单句语法填空
①He had his car repaired(repair) sn after the accident.
②Teachers wn't have us cpying(cpy) frm ther students' hmewrk.
③I'm srry I can't g with yu.I have sme clthes t_wash (wash)．
[能力提升]——一句多译
一旦他下定决心，就没有什么能让他改变。
①Once he makes up his mind，nthing can have_him_change it.(have)
②Once he makes up his mind，nthing can get_him_t_change it.(get)
13．(教材P35) Smetimes he acts as_if_he_desn't_lve_us_ at_all.有时他表现得好像他根本就不爱我们。
eq \a\vs4\al(as if/thugh,所引导的,从句中的,语气及时,态：as if/,thugh)\b\lc\{\rc\ (\a\vs4\al\c1(陈述语气真实或极有可能发生的情况,\a\vs4\al(虚拟语气不真,实或不可能发,生的情况)\b\lc\{\rc\ (\a\vs4\al\c1(虚拟现在：did,虚拟过去：had dne,虚拟将来：wuld/might/,culd＋d))))
[金句推送](2018·北京卷·写作佳句) It seems as if yu are really enthusiastic abut Chinese culture.
你似乎对中国文化很感兴趣。
[基础练习]——单句语法填空
①She lks after the rphan as if he were (be) her wn child.
②The class burst int cheers as if we had_discvered (discver) a new wrld.
③The rm lks as if/thugh it isn't huge enugh t cntain s many bks and magazines.
[能力提升]——句式升级
(普通表达)He pened his muth as if he wuld say smething.
(高级表达)He pened his muth as if t_say smething.(省略形式)
[名师点津] 如果as if从句的主语和主句的主语相同，且含有be动词，则从句中可省略主语和be动词。
14．(教材P37) Als，every_time_I_watch_a_DVD he sends me t bed r tells me t spend mre time studying.还有，每次我看DVD，他都催着我上床睡觉，要么就是让我多花些时间学习。
every time引导的时间状语从句中用一般现在时代替一般将来时，用现在完成时代替将来完成时。常用来引导时间状语从句的名词词组有：
(1)由time构成的名词词组：each time，the first/last time，next time，any time等。
(2)the＋瞬间名词：the minute，the instant，the secnd，the mment等。
(3)the＋时间名词：the day/week/year，the spring/summer/ autumn/winter等。
[金句推送](2016·全国卷Ⅱ·写作佳句)I remember yu shwed me sme phts n that theme every time yu visited ur schl.
我记得你每次来我们学校都给我看一些关于这个主题的照片。
[基础练习]——单句语法填空
①I still remember that the first time we met at schl，yu were reading in the classrm.
②The day I left here，they all came t see me ff.
③He is welcme t cme back any time he wants(want) t.
[能力提升]——句式升级/完成句子
①(普通表达)As sn as Lang Ping stepped int the stadium，nbdy culd stay seated.
(高级表达) The_mment/minute/instant/secnd_Lang_Ping_ stepped _int_the_stadium，nbdy culd stay seated.(the＋瞬间名词)
②每次和她交谈，我都会为其深刻的见解而感到惊奇。
Every/Each_time_I_talk_t_her she surprises me with her insight.
[名师点津] the first time可以用作连词，引导时间状语从句。fr the first time 也表示“第一次”，只作状语，不引导从句。
多维训练——夯实基础
维度1——用所给词的正确形式填空
1．It is implite t have yur guest waiting (wait) all the time.
2．It is high time that we frbade setting (set) ff firewrks in urban areas.
3．It's true that she made a mistake but she desn't deserve t_lse (lse) her jb.
4．If yu are nt careful，children tend t_neglect (neglect) their hmewrk.
5．Parents are suppsed t_trust (trust) their children，which is beneficial t their grwth.
6．He wishes t dcument it in sme frm r anther，every time he sees (see) smething new.
7．Lcal residents said it was as if there had_been(be) a nuclear explsin.
8．He als insisted that they (shuld)_leave(leave) enugh space fr children.
9．T save the expense，the number f daily guests is_limited (limit) t less than 100.
10．I dn't like t wash clthes，s I always have my clthes washed(wash)．
维度2——在空白处填入一个适当的词
1．They rushed t the scene，where a terrible traffic accident happened.
2．When the dr was pened suddenly，the by cvered his head with his hands，as if in defence.
3．The directr annunced n the scene at the awards party that the best actress f the film was abut t cme n the scene.
4．It upset him that nbdy had bthered t tell him abut the change f the meeting.
5．There's n great harm in drinking a little beer t relieve tiredness after hard wrk.
维度3——查缺补漏
单句语法填空
1．An excellent teacher wn't tlerate cheating (cheat) in the examinatins.
2．The little girl gt frightened (frighten) when she saw a big dg.
3．The teacher gave a clear explanatin (explain) n the use f the wrd.
4．The prgram's gals are t help girls develp basic skills f slving prblems and handling (handle) relatinships with thers.
5．Fish­keeping is a widespread hbby and the keeper can bserve their behaviur (behave) in the glass tank and study their entire life cycle.
单句改错
6．All the peple were fighting against the earthquake in defence fr their wn hmes.fr→f
7．My mther encuraged me and insisted that I cntinued my educatin. cntinued→cntinue
维度4——话题写作
1．补全要点句 (加黑体部分请利用本单元所学词汇)
①青春期是我们青少年走向成年的一段时期。
Adlescence_is_a_perid when we teenagers grw t adults.
②我们经历一些身体上和心理上的变化。
We g_thrugh sme physical and psychlgical_changes.
③我们经常感到孤独，对周围变化中的世界感到困惑。
We ften feel lnely and becme_cnfused_with the changing wrld arund us.
④我们可能面临很多困难和挑战。
We may face a lt f difficulties_and_challenges.
⑤我们渴望独立，想要表现得像成年人。
We desire_independence and want t act like adults.
⑥父母不能容忍我们的一些行为。我们认为它们是正常的。
Our parents can't tlerate_sme_f_ur_behavirs.We think they are_nrmal.
⑦烦恼似乎多于收获。我们相信二者会让我们的生活变得更加丰富多彩。
It seems as_if pains are mre_than_gains.We believe bth f them will make_ur_life_mre_clrful.
2．升级平淡句
(1)先利用as well as升级1中的句②中的and，再用连词and合并1中的句①②
Adlescence_is_a_perid_when_we_teenagers_grw_t_adults_and_during_this_perid_we_g_thrugh_sme_psychlgical_changes_as_well_as_physical_nes.
(2)利用which引导限制性定语从句升级1中的句⑥
Our_parents_can't_tlerate_sme_f_ur_behavirs_which_we_think_are_nrmal.
(3)利用althugh引导让步状语从句升级1中的句⑦
Althugh_it_seems_as_if_pains_are_mre_than_gains，we_believe_bth_f_ them_will_make_ur_life_mre_clrful.
3．衔接成美文 (注意利用适当的过渡衔接词汇：fr example，besides，hwever)
Adlescence is a perid when we teenagers grw t adults and during this perid we g thrugh sme psychlgical changes as well as physical nes.Fr example，we ften feel lnely and becme cnfused with the changing wrld arund us.Besides，we may face a lt f difficulties and challenges.We desire independence and want t act like adults.Hwever，ur parents can't tlerate sme f ur behavirs which we think are nrmal.Althugh it seems as if pains are mre than gains，we believe bth f them will make ur life mre clrful.
三言
两语
1.My parents nt nly gave me life，but als brught me up with selfless lve and supprt，feeling s prud f my every tiny bit f prgress.
2．In my pinin，yu shuld aplgize t yur mther，as she has dne nthing wrng t prevent yu frm the Internet addictin.
3．Just as the saying ges，“One tree desn't make a frest.”and ur success is based n cperating with thers.
1.从那时起，我发现微笑是我们日常生活中避免任何可能的冲突的最好方法。
Ever_since_then，I have fund that smiling is the best way t_avid_any_pssible_cnflict in ur daily life.
2．只有通过将自己与他人进行比较我们才能知道自己薄弱的地方，然后我们会努力将自己提升到一个更高的水平。
Only_by_cmparing_urselves_with_thers_can_we_knw where we are weak，and we'll make effrts t_imprve_urselves_t_a_higher_level.
高
频
短
语
1.stay_up 不睡觉，熬夜
2．alng_with 与……一起
3．at_present 现在
4．turn_up 调高(音量)；出现
[语境运用] (填入一个适当的词)
Wrried abut their sn wrking in a distant area，the mther stayed ①up all night and at last she, alng ②with her husband，went t see him.The sn is wrking hard ③at present and ften chats with her n the phne.
5.be_hard_n 对……苛刻，对……严厉
6．can't_wait_t_d_sth.迫不及待地做某事
7．be_suppsed_t 应该……，应当……
8．take_in 吸收；欺骗
[语境运用] (填入一个适当的词)
When I was yung，my mther was hard ④n me and she thught I was suppsed ⑤t be hardwrking.Every time I came back frm schl，she culdn't wait t questin me abut what I had learned in class in case I tk her ⑥in.
9.mix_up 混淆，弄乱；搅匀，拌和
10．keep_up_with 赶上，跟上
11．d_with 处理，对付
12．let_ut 放出；泄露
13．depend_n 依赖，依靠
[语境运用] (填入一个适当的词)
This year my mther is in her seventies，and she finds it harder and harder t keep up ⑦with the develpment f mdern technlgy.She tends t frget sme e­mails r get them mixed ⑧up.Luckily，I can help her t d ⑨with them.
教材原句背诵
句式仿写应用
1.has/have＋宾语＋宾语补足语
Daniel has his arms crssed and lks upset.
为了环保，我们最好将这些废品进行回收利用。
Fr envirnmental reasns，we'd better have_these_wastes_recycled.
2.as if “似乎，好像”，引导方式状语从句
Smetimes he acts as if he desn't lve us at all.
他对那儿的老人很好，好像他们是自己的亲人。
He treats the ld peple there well as_if_they_were_his_wn_relatives.
3.every time“每次”，引导时间状语从句
Als，every time I watch a DVD he sends me t bed r tells me t spend mre time studying.
每次我去看她时，她都全神贯注于研究工作。
Every_time_I_went_t_see_her，she was absrbed in her research wrk.
[句型公式] 句中has his arms crssed是have sth.dne结构。
have的常用句型结构：
[句型公式] as if(＝as thugh)“似乎，好像”，在本句中引导方式状语从句，它也可用在lk，seem，sund等系动词后引导表语从句。
[句型公式] 句中every time是名词短语，相当于连词，引导时间状语从句。