人教版 (2019)选择性必修 第三册Unit 2 Healthy Lifestyle学案

这是一份人教版 (2019)选择性必修 第三册Unit 2 Healthy Lifestyle学案，共4页。

情境创设·语法精讲
见学用28页
教材链接
（1）（教材P14）Hwever, during this perid, it can be easy fr sme f them t frm bad habits.
（2）（教材P14）T change bad habits is never easy, even with many attempts.
（3）（教材P15）After all, it is nt easy t break bad habits.
（4）（教材P16）Changing a bad habit is difficult, and it is easy t make excuses and give up.
观察上面句子，动词不定式在这些句子中作的是主语；it 在句中为形式主语。
要点精析
动词不定式作主语时，相当于名词或代词的作用，一般表示具体的、一次性的动作。
1. 单个不定式作主语时，谓语动词通常用第三人称单数形式。两个或两个以上的不定式作主语时，若语意基本一致或不定式作为一个整体，谓语动词用单数；若语意不一致，则用复数。
T get enugh prtein each day is beneficial t ur health. 每天摄取足够的蛋白质对我们的健康有益。
T lve and t be lved is sweet t us. 爱和被爱对我们来说都是甜蜜的。
T imprve peple’s lives and t speed up scial cnstructin are tw imprtant tasks. 改善人们的生活和加快社会建设是两项重要任务。
2. 动词不定式作主语时，若不定式太长，为避免头重脚轻，常用it作形式主语，将真正的主语置于后面。
It is impssible t rely n yur parents all yur life.
你不可能一辈子都依靠你的父母。
It is essential t reserve a table in advance f festivals. 在节日前预订桌位是有必要的。
3. 常用句型
（1）It is+adj.+（fr/f sb.） t d sth.
如果形容词表示的是不定式的逻辑主语的性质、身份、特点，如careless, clever, gd, kind, flish, hnest, lazy, nice, silly, wise等，用介词f。
如果形容词表示的是事物或行为的特点或性质，如difficult, easy, hard, imprtant, impssible, necessary, incnvenient, essential 等，用介词fr。
It is implite f yu t disturb thers. 打扰他人是不礼貌的。
It is difficult fr us t finish writing the cmpsitin in a quarter f an hur. 在十五分钟内写完这个作文对我们来说太难了。
（2）It is+n.+t d sth. 做某事是……
It is a hard task t change lng habits in a shrt time.
要在短时间内改掉长期养成的习惯是一项艰巨的任务。
It is a dctr’s duty t heal the wunded and rescue the dying. 救死扶伤是医生的职责。
（3）It takes/tk sb. sme time t d sth. 做某事花费某人多长时间
It takes us nine years t build the Hng Kng-Zhuhai-Maca Bridge. 建造港珠澳大桥花费了我们9年的时间。
It tk me mre than an hur t d my hmewrk yesterday. 昨天我做作业用了一个多小时。
实战演练
Ⅰ. 单句语法填空
1.（2020课标全国Ⅲ）It is traditinal t bring (bring) a gift t a husewarming party.
2.（2020课标全国Ⅲ）It’s hard t tell (tell) exactly hw many peple agree with him, but research indicates that the numbers have been rising fr sme time.
3.（2020江苏）The implicatin f these results is that t gain the greatest health benefits frm exercise, it may be wise t skip (skip) eating first.
4.（2019课标全国Ⅰ）It is difficult t figure (figure) ut a glbal ppulatin f plar bears.
5.（2019天津）Then we will knw hw imprtant it is t have meaning in ur life.
6.Cming ut f this experience, I realize it’s OK t be (be) different frm thers.
7.It was implite f yu t speak t an utstanding teacher like this.
8.It tk years f wrk t reduce (reduce)the industrial pllutin and clean the water.
9.It’s very imprtant fr the new cmers t study sme rules.
10.T lse heart means (mean) failure.
Ⅱ. 完成句子
1.我认为你问面试会持续多久是不礼貌的。(implite)
I think it is implite f yu t ask hw lng the interview will last.
2.她花了一个多小时的时间来分析这些有助于她写研究报告的数据。(analyze)
It tk her mre than an hur t analyze the data which helped her write research reprts.
3.事实上，一开始就进行太多的锻炼对你的身体健康是有害的。（不定式作主语）
Actually , t start with t much exercise is bad fr yur physical health.
4.汤姆很固执，所以你要说服他改变主意是很不容易的。(persuade sb. t d sth. ; change ne’s mind)
Tm is stubbrn, s it’s nt easy fr yu t persuade him t change his mind .
5.那位老人无私地把食物送给街上无家可归的人。(selfless; give away)
It’s selfless f the ld man t give away fd t the hmeless in the street.
6.父亲批评了我并告诉我捉弄别人是错误的。(play tricks n sb.)
Father criticized me and tld me it was wrng t play tricks n thers .
7.成为一名专业的运动员不容易，需要日复一日的坚持。（不定式作主语）
T be a prfessinal athlete is nt easy and it needs persistence day in and day ut.
8.无人驾驶汽车什么时候能够在道路上随处可见，这是很难预测的。（it作形式主语）
It is hard t predict when driverless cars will be seen everywhere n the rads.
9.对于外国人来说，能够自由使用筷子不是一件容易的事。(it is+n.+t d sth.)
It is nt an easy thing fr the freigners t use chpsticks freely.
10.如今，很多人意识到教给孩子书写技巧是很有必要的。（it作形式主语）
Nwadays, many peple realize it is necessary t teach children the skill f handwriting.