一些介词或动词的宾语从句如果由连词 that 引导，则 需用 it 先行一步，作形式宾语。
还有些动词后接宾语从句习惯上需要在宾语从句前加 it，这类词有:
A) 动词＋it＋when / if 从句。常见于appreciate, enjoy, like, dislike, love, hate, prefer等少数动词之后。
B) 动词 + 介词(短语) + it + that从句。常见于answer for, depend on, rely on, insist on, look to, see to, stick to 等结构中。
三、 表语从句：
A is to B what C is to D
四、同位语从句
1. 定义：在复合句中，对名词的内容进行解释说明的从 句是同位语从句。
•anWyhooneevwerhios in charagneyothf itnhge tshuabtject should attend the meeting.
定从 or 名从
1. He gave his mother a gift which pleased her very much.
1. Facing flowers, perfume and make-ups, he wonder which one can please his mother.
, • _A_s_ is known to all the earth is round.
1.A new school has been set
in the place w__h_e_r_e__ there used to be a lake.
up
in the place __t_h_a_t/_w_h_i_c_h__ used to be a lake.
2. It +Vi.(happened/ appeared/ seemed/ occurred to sb.)+ that从句
二、宾语从句
1. it作形式宾语：1）7123结构；2）表“好恶”的动词： love/like/enjoy/ dislike/hate+it+when从句;
depend/ rely/ count on/upon +it+ that从句; appreciate+it+if从句。 3）其他：take it for granted that… 2. 语序是陈述语气。 3. whether与if的区别
9. The question is if he himself will be present at the meeting. The question is whether he himself will be present …...
10. He asked me if I could go with him or not. He asked me whether I could go with him or not.
2. 以下名词跟同位语从句，且常用that 引导。名词有： fact, idea, news, promise, information, message, belief, doubt, hope, opinion, possibility, thought, wish, truth, question, problem, reply, answer, report, suggestion, advice, order等。
掌握： whether和if的区别：
We’ll see to _i_t__ __th_a_t__she gets home early . I hate\dislike __i_t____when someone smokes in the office. I’ll appreciate ___i_t___ if you come to our party.
五、注意：1. 表“建议、命令、要求”的词（名词或动词），其后 跟宾从、表从或同位语从句时，需用虚拟语气（should+动原， should可省。）
2. 仔细揣摩that和what的区别。 3. 关注wh-+ever引导的名词性从句。（wh-ever的意思和用法）
温馨提示 同位语从句通常由that引导，但根据 接同位语的名词不同，也可由whether, when, who, how, what, why等引导。 e.g. I have no idea when he will be back. The question who was to blame has never been settled.
1、If不能引导主语从句，而whether可以。 2、引导表语从句用whether，不用if。 3、引导同位语从句用whether，不用if。 4、whether可以引导从句作介词的宾语，不用if 。 5、whether or not; whether to do; discuss whether
找出下列句子中的错误，并总结出规律：
(5)It doesn’t matter/makes no difference wh-没关系/影响。
1. It was quite clear _t_h_a_t_ his uncle was fond of music.
2. It is important that we _(s_h_o_u_l_d_)_s_t_u_d_y(study) hard.
(_s_h_o_u_l_d_)_b_e_f_i_n_is_h_e_d_ (finish) in five hours.
whever和“no matter＋wh” whever既可引导名词性从句，又可引导 让步状语从句，而no matter wh只能引导让 步状语从句。 e.g. Whatever/ No matter what I said，he wouldn’t listen to me. (让步状语从句)
分类
1、主语从句 ( subject clause ) 2、表语从句 ( predicative clause ) 3、宾语从句 ( object clause ) 4、同位语从句 ( appositive clause )
引导词
从属连词（3个）：that 、if、 whether
连接代词 （9个）：who、 whom 、 what、 which、 whose、 whoever whomever、 whatever、 whichever、
It is natural /strange/important/obvious that…
很自然/奇怪的/很重要的是/很明显的是…
It is likely that…=sb./sth. is likely to do 很有可能
(3) It ＋ 不及物动词 ＋ 从句 It happened that…碰巧…
连接副词（4个）：when、 why、 where、 how
一、常用连接词3种（必须背熟）
1.在句中不作成分且无意思的连接词：that
2.在句中不作成分但有意思的连接词：whether/ if是否， as if/as though似乎，好像
3.在句中作成分也有意思的连接词： what什么，所……的，随句翻 译（主、宾、表）；who谁，……的人（主、宾、表）；which哪 一（个/类等）（主、宾、定）；when何时，……的时候（时间状 语）；where何地， ……的地方（地点状语）；why为什么，…… 的原因（原因状语）；how如何（方式状语）；whatever无论什么； whoever无论是谁；whenever无论何时；wherever无论哪里； whichever无论哪一（个/类等）；however不管怎样；
英语名词性从句
Noun Clause
请思考：
1、English is very useful for us . 2、The subject I am interested in is English. 3、We need to master English well. 4、He want to learn the language , English .
二、 从句复习重点：1. 宾语从句（其各个注意事项）
2. 主语从句 （各个主语从句的各个句型，尤其是用it作形式主语）
3. 同位语从句的定义（尤其是哪些名词后常用来跟同位语从句）
4. 表语从句句型（A is to B what C is to D）
一、 主语从句 (it作形式主语)
1.It +be+n. /adj. / P.P+ to do/ that从句/doing
He would believe whatever/ anything that I said. (宾语从句)
• _w_h_a_t_ is known to all is that the earth is round.
• _I_t_ is known to all that the earth is round.
7. If we will have a meeting hasn't been decided yet. Whether we will have a meeting hasn’t been decided yet.
8. It depends on if the weather is suitable for us to do it. It depends on whether the weather is …...
in ___w_h_a_t_______used to be a lake.
___w_h__e_re____ there used to be a lake.
• Of all the toys, you shall get whichever you choose.