人教版高中英语必修三课件：Unit4 主语从句.ppt

(2) if与whether
_W_h_e_t_h_e_r he will go to Beijing or not was not clear.
It was not clear _W_h_e_t_h_e_r/_if__ห้องสมุดไป่ตู้he will go to Beijing. 总结: 如果whether从句位于_句_首___，或者与 _or__no_t_连用时，不能用if替换 如果句中借用了__it___作形式主语，引导词 可以用__if____替换whether。
excited the whole day.
A. If
B.Whether
C.That D.Where
④____C__ makes mistakes must correct them.
A. What B. That C. Whoever D. Whatever
考点二： it 作形式主语
(1) It的用处：为了避免主语冗长和句子 _头__重_脚__轻__, 经常用it作_形__式_主__语__,主语从句放 在_句_末__作真正的主语。 Eg:That he will refuse this piece of advice is impossible.（用it做形式主语改写句子） It is impossible that he will refuse this piece of advice.
accident
5. ___H_o__w_______ he solved the problem successfully
interested all of us.
6. _W__h_o_/_w_h__a_t__ is to be sent there to solve the problem hasn't
陈述语序 即 _连__接_词__+_主__语__+谓__语__+_其_它_ 【活学活用]】 ①_W_h_e_n_h_e_w_il_l c_o_m_e（他什么时候会来）is not known. ② Why was Lily late is not important.（改错）
Lily was
★ 注意问题: (1)区分what和that
(3) 主谓一致
When he will come ____is___(be) a puzzle.
When they will start and where they will go ___a_re__(be) decided so far.
When and where they will go __i_s__(be) decided so far.
• 1.What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.
• 2. ...it was not clear whether the shape would last or not. • 3. What is even more important is that as the earth cooled
down, water began to appear on its surface. • 4. It was not immediately obvious that water was to be
fundamental to the development of life. • 5.What many scientist believe is that the continued
presence of water... • 6.Why they suddenly disappeared still remains a mystery. • 7. Whether life will continue on the earth for millions of years
to come will depend on whether this problem can be solved.
with what we feel.【2015·北京】
A.Where B.How C.Why D. When
②____B_ we'll go camping tomorrow depends on the
weather.
A.If B. Whether C. That D. Where
③ ____C__we'll go camping tomorrow has kept us all
been decided.
。 II. 下列各句中均有一处错误，请改正
1. WThhat the old man's son wanted to know was where the gold had been hidden.
2. WThhaetther the 2008 Olympic Games will be held in Beijing excited the whole nation.
(2)it 作形式主语常见的结构
• ①It+be+__形__容__词____+that从句
(obvious, true, natural, surprising, wonderful, possible, likely, certain, probable)
• Eg:显然他撒谎了。
___It__w_a_s__o_b__v_i_o_u_s__t_h_a_t_h__e_t_o_l_d__a_l_i_e_.______
⑤It + _vt._(及_物_动_词_)+ O_._(宾_语__) +that从句
Eg, It surprised/ amazed me that he should talk to his teacher in such a rude manner. (此处should表？)
考点三： 主从的语序
• 特别注意：It is important / natural / necessary / impossible/unbelievable/incredible/strange that...句型中, 主
语从句应使用___虚__拟___语气, 即用“(s_h__o_u_l_d_)+ 动词原形”的
形式。
• W__h_at__you said yesterday is right.
• T_h_a_t__she is still alive is a great news to all of us.
• 总结：what在从句中__充_当__成分，如 _主_、__宾_、__表___；that在从句中不__充__当_成分,只 起_连__接_作用_无___意义不__可_省略。
5. It's strange wthhaten he should have gone away without telling us.
3. WWhhoaetveevrer leaves the room last ought to turn off the lights.
4. WHohewther our spring sports meet will be held or not this week is not known yet.
(said, reported, thought, expected, decided, announced, arranged, etc.). Eg:据报道，有五个人被埋在废墟中。 It__w_a_s_r_e_p_o_r_t_e_d_t_h_a_t_f_iv_e__p_e_o_p_le__w_e_r_e_b__u_ri_e_d__in__t_h_e___ r_u_in_s_.______________
• Eg:我们学好英语是必要
的.I_t_w__a_s__n_e_c__e_s_s_a_r_y__th__a_t_w__e__(s_h__o_u_l_d_)_l_e_a_r_n______ English well.
②It+be+_名_词_或__名_词_词_组___+that从句
• (no wonder, an honor, a good thing, a pity, no surprise, etc.).
• Eg:他很懒.。难怪他这次考试不及格。 H_e__is__ve_r_y_l_a_zy_._It_w__as__n_o_w_o_n_d_e_r_t_h_a_t _he_____ f_a_il_e_d_in__th_e__ex_a_m__. _
③It+be+__过_去_分_词__V_-e_d_+that从句
What he needs__is__ that book. What he needs _a_r_e_some books.
总结： ① 从句作主语时，谓语动词多用_单__数___形式。 ② 如果由and连接两个或两个以上的主语从句作主语时，谓语动词用 __复__数__形式；由两个或多个连接词引导一个主语从句时，谓语动词用 __单__数____ ③ what 引导的主语从句，主句动词的单复数形式由_表__语_____决定. （what 用法较特殊)
{ 导 主语 His job is important. What he does is important. 主语从句的定义：
在句中充当主语的从句叫做主语从句。
Subject Clauses 主语从句
思Task1: Find the sentences which are subject clause in the reading passage, then underline the subject clauses.
④It+_不_及_物_动__词_及_短_语_+(连接词不固定)从句
（seem/happen/appear/matter/turn out/occur to/makes no difference等） Eg:你今天来或者明天来都没关系。 _It_d_o_e_s_n_'t_m_a_t_te_r_w_h_e_t_h_e_r _yo_u__c_o_m_e_t_o_d_a_y_o_r__ _to_m_o_r_r_o_w_. ____
特别注意:在 It + be
+suggested/advised/ordered/requested/insisted/r equired/demanded 中, that从句的谓语也应该用 _虚__拟__语气, 即用“(__s_h_o_u_ld_)+ 动词原形”的形式。
Eg:人们建议应该采取更多措施来保护环境。 _It_i_s_s_u_g_g_e_s_t_e_d__th_a_t_m__o_r_e_m__e_a_s_u_r_e_s_(_s_h_o_u_l_d_) _b_e_t_a_k_e_n _to__p_ro__te_c_t_o_u_r__e_n_v_ir_o_n_m__e_n_t.________
Task2：主语从句的引导词：
• 从属连词 that , whether，if
• 连接代词 who(ever), whom(ever),
which(ever), what(ever)，
whose • 连接副词 where ,when ,why ,how
议、展、评
考点一：连接词的选用
[活学活用] ① ____B__we understand things has a lot to do
检 I. 用适当的连接词填空，使句子意思完整。
1. __W__h_y_____ he didn't attend the meeting yesterday wasn't
quite clear.
2. __W__h_i_c_h___ team will win the match is still unknown. 3. __W__h_o_e_v_e__r_ comes to the party will receive a present. 4. It's reported __th__a_t______ three people were killed in the