人教版 (新课标)选修7&8Unit 1 A land of diversity课文内容ppt课件

这是一份人教版 (新课标)选修7&8Unit 1 A land of diversity课文内容ppt课件，共17页。

第四学时　Grammar
语 法 精 讲
一、引导名词性从句的引导词可分为三类
1．连接词。(1)引导词that本身无词义，引导陈述句语气在从句中不充当成分。That_he_passed_the_examinatin made his mther very happy.(2)引导词whether/if/as if有词义，但在从句中不充当成分，如whether，if和as if 。It seems as_if_he_were_nt_interested_in_this_prject．
2．连接代词。引导词本身有词义且在句中充当成分，如wh，whm，whse，what，which。I dn't knw wh/whm_I_shuld_believe．3．连接副词。引导词本身有词义且在句中充当成分，如when，where，why，hw。 We haven't decided when_we'll_g_t_Tibet．
二、主语从句、表语从句和宾语从句
1. 主语从句在整个句子中作主语，包含两类，形式主语和真正主语。(1)that引导主语从句时不能省略。That_the_driver_culd_nt_cntrl_his_car was bvius.(真正主语)It was bvius that_the_driver_culd_nt_cntrl_his_car．(形式主语)
(2)if不能用在句首引导主语从句，这时用whether；与r nt 搭配表“是否”时，也只能用whether。 Whether_he_left_(r_nt) is unknwn.(3)当主语是一个从句时，谓语动词一般用第三人称单数。What_we_need is mre time and mney.
2．表语从句出现在系动词后。The truble is that_we_are_shrt_f_mney．G and get yur cat.It's where_yu_left_it．(1) 引导表语从句除了上述三类词外还有because，as if/as thugh等。请注意下列句型：①The reasn (why/fr which...) is reasn why he was absent was that he was ill.The reasn why he failed in the exam is that he was s lazy and careless.
②It/This/That is is because_yu_dn't_knw_hw_much_I_lve_yu．(2) 连系动词appear，lk，seem的两个常用句型：①It seems/appears that...②It lks/seems as if/as thugh...(与事实相符用陈述语气，与事实相反用虚拟语气)It seems as_thugh_he_knew_nthing_abut_the_truth．(3) as 也可以引导表语从句。Things are nt always as_they_seem_t_be．
3．宾语从句作及物动词、be＋形容词和介词的宾语。(1)宾语从句的时态与主句相呼应，但宾语从句表示的是客观真理或普遍现象时，从句谓语常用一般现在时。The teacher tld us that_the_earth_mves_arund_the_sun．I'm afraid that_it_will_rain_tmrrw．(宾语从句)He is interested in_what_his_teacher_said．(介词＋宾语从句)
They dubt whether it_is_useful．(及物动词＋宾语从句) (2)连词whether和 if可以互换，但要注意下列情况： ①连词后紧跟r nt时用whether。I want t knw whether_r_nt_they_will_cme．②从句作介词宾语时用whether引导。He was interested in whether_he_saw_her_there．③连接词后直接加不定式，不能用if只能用whether。He desn't knw whether_t_stay_r_nt．
④位于句首疑问语气的主语从句引导词，只能用whether.Whether he will succeed depends n his attitude.⑤位于句首疑问语气的主语从句引导词，只能用whether.Whether he will succeed depends n his attitude.⑤如果宾语从句是否定时，一般用if引导。I care if_he_will_nt_attend_the_meeting．(3) 当宾语从句后带宾补时，要用句型“主语＋谓语＋it ＋宾补＋that从句”。
I think it certain that_she_will_d_well_in_her_exam．(4) 当主语是I，we，动词 think，believe，suppse，expect，imagine后带否定意义的宾语从句时，要将否定转移到主句。I dn't_think he will win the game，will he?
4．注意区分it 作形式主语的主语从句与强调句的区别。强调句句型“It is/was＋被强调部分＋that”，去掉“It ”，句子仍然成立。It is natural that_they_shuld_have_different_views．(主语从句)It_is nly lately that he has had a family himself.(强调句)It_was in the htel where he stayed that we discussed the serius prblem.(强调句)
5．注意it 作形式主语的主语从句和as引导的非限制性定语从句的不同。It is knwn t all that_the_earth_is_rund．(主语从句)As_is_knwn_t_all，the earth is rund.(非限制性定语从句)