例句：Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.
c.当that从句是双宾语中的直接宾语时，that不可省。
例句：I can’t tell him that his mother died.
d.注:许多带复合宾语的句子，that引导的宾语从句经常移到句子后部，而用it作形式宾语。
例句：I find it necessary that we should do the homework on time.

（二）由whether,if 引导的宾语从句
1.由whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。意思是“是否”。宾语从句要用陈述句语序。
一般说来，在宾语从句中whether与if可以互换使用，但在特殊情况下if与whether是不能互换的。
例句：I wonder whether(if) they will come to our party.

2.只能用whether，不能用if引导的宾语从句
a.在带to的不定式前
例句：We decided whether to walk there.
b.在介词的后面
例句：I’m thinking of whether we should go to see the film.
c.在动词后面的宾语从句时
例句：We discussed whether we had a sports meeting next week
d.直接与or not连用时
例句：I can’t say whether or not thet can come on time.

3.只能用if不能用whether引导的宾语从句
a.if引导条件状语从句，意为“如果”
例句：The students will go on a picnic if it is sunny.
b.if引导否定概念的宾语从句时
例句：He asked if I didn’t come to school yesterday.
c.引导状语从句even if（即使）和as if（好象）时
例句：He talks as if he has known all about it.

if,whether在宾语从句中的区别
a.if和whether在作“是否”解时,引导宾语从句常放在动词know,ask,care,wonder,find out等之后,介词后一般不用if
b.少数动词,如:leave,put,discuss,doubt后的宾语从句常用whether. 
c. whether后可以加or not,但是if不可以.
d.在不定式前只能用whether.
（如：I can’t decide whether to stay. 我不能决定是否留下。）
e.避免歧异时,我们常用whether而不用if.

（三）连接代词和连接副词引导的宾语从句
这样的宾语从句实际上是由特殊疑问句变化而来的，宾语从句要用陈述句语序。
用于这种结构的动词常常是：see, say, tell, ask, answer, know, decide, show, find out, imagine, suggest, doubt, wonder, discover, understand, inform, advise等。
1.英语中的连接代词有：who,whom,whose,which,what,在句中担任主语、宾语、定语或者表语。
例句：Can you tell me whom you are waiting for?
2.英语中的连接副词有：when,where,why,how，在句中担任状语的成分。
例句：None of us knows where these new parts can be bought.

简化宾语从句常用六法：
方法一：
当主句谓语动词是hope， decide， wish， choose， agree， promise等，
且宾语从句的主语与主句主语一致时，宾语从句可简化为不定式结构。
例如：
Li Ming hopes he will be back very soon.
→Li Ming hopes to be back very soon.
We decided that we would help him.
→We decided to help him.

方法二：当主句谓语动词是know， learn， remember， forget， tell等动词，
且主句主语与从句主语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：
She has forgotten how she can open the window.
→She has forgotten how to open the window.
注：当主句谓语动词是tell， ask， show， teach等动词，
且后带双宾语，从句主语和间接宾语一致时，宾语从句可简化为“疑问词+不定式”结构。例如：
Could you tell me how I can get to the station？
→Could you tell me how to get to the station？

方法三：当主句的谓语动词是order（命令），require（需要）等时，
如果主句和从句的主语不一致，宾语从句可简化为“名词（代词）+不定式”结构。例如：
The headmaster ordered that we should start at once.
→ The headmaster ordered us to start at once.

方法四：某些动词后的宾语从句，可以用介词加动名词（短语）等其他形式简化。例如：
He insisted that he should go with us.
→He insisted on going with us.
The poor boy doesn’t know when and where he was born.
→The poor boy doesn’t know the time and the place of his birth.

方法五：某些动词后面的宾语从句可转化为“宾语+V-ing形式（作宾语补足语）”结构。例如：
Liu Ping found that there was a wallet lying on the ground.
→ Liu Ping found a wallet lying on the ground.

方法六：动词seem后的宾语从句，也可以用不定式（短语）来简化，但句型需要进行适当的变化。例如：
It seemed that the boys were going to win.
→The boys seemed to win.
除上述方法外，还有一些特殊句式的转化。例如：
I found that it was difficult to learn English well.
→I found it difficult to learn English well.
Soon we found that the ground was covered with thick snow.
→Soon we found the ground covered with thick snow.
They found that the box was very heavy.
→They found the box very heavy

 

考点名称：主谓一致

• 英语中的一致主要包括主语和谓语在人称和数上的一致、时态一致、名词和其代词的一致。
  主语和谓语保持一致叫主谓一致，即谓语动词的形式必须随着主语单、复数形式的变化而变化。

• 主谓一致原则:
  1、语法上的一致
  所谓语法一致原则，即主语和谓语的语法形式在人称和数上取得一致。
  谓语的单、复数形式依据主语的单、复数形式而定：主语为复数，谓语动词用复数；主语为单数或者是不可数名词，谓语动词用单数。
  China belongs to the Third World. 中国属于第三世界。
  We are sure he will come. 我们肯定他会来。
  使用语法一致的情况
  （1）当主语是and，both…and连接的并列结构
  如果主语指的是两个或两个以上的人或物，则谓语动词用复数。
  My mother and I have seen the film. 我妈妈和我已看过这部电影。
  Both rice and wheat are grown in this part of China. 在中国的这个地方既种稻子又种小麦。
  注意：由and连接的并列主语前面分别有each，every，no修饰时，其谓语动词用单数形式。
  Every boy and every girl has to receive education in our country. 在我国每一个男女孩子都得受教育。
  No student and no teacher was invited to the party. 师生没有被邀请参加晚会。
  （2）主语后面接说明主语的修饰语
  主语后面接说明主语的修饰语如：
  with，along with，together with，as well as，like，rather than，but，except，besides，including，in addition to，
  谓语动词不受修饰成分的影响，仍保持同主语一致的关系。
  The teacher with two students was at the meeting. 那位老师和两个学生参加了会议。
  The girl as well as the boys has learned to drive a car. 这个姑娘和男孩子一道，也学会了开汽车。
  A library with five thousand books is offered to the nation as a gift.一个有5000册书的图书馆作为礼物赠送给了国家。
  E-mail, as well as telephones, is playing an important part in daily communication.电邮和电话在日常的通信中起着很重要的作用。
  Nobody but Jane knows the secret.只有简知道这个秘密。
  All but one were here just now. 刚才除了一个人外都来了。
  （3）非谓语动词或从句作主语
  非谓语动词 (动词的-ing形式、不定式)或从句作主语时，谓语一般用单数形式。
  When and where to build the new factory is not decided yet.什么时候在什么地方建新工厂还没定下来。
  Checking information is very important. 核实事实是非常重要的。
  To learn foreign languages is not easy. 学习外语并非易事。
  When we will hold the meeting is not decided yet. 我们何时开会尚未决定。
  注意：当what引导主语从句或由 and连接两个动词不定式或动名词作主语时，谓语动词的数应根据意义一致的原则来决定。
  What we need here is money．我们这里需要的是资金。
  What we need here are workers．我们这里需要的是工人。
  Lying and stealing are immoral．说谎与偷窃是不道德的。
  （4）each和复合不定代词作主语
  each和some/any/no//every十body/one/thing构成的复合不定代词：
  anyone、anybody、anything、everyone、everybody、everything、someone、somebody、something、no one、nobody、nothing、each、the other作主语，谓语动词用单数。
  Each is worse than the one before. 一个比一个差。
  Nobody knows the answer. 没有一个人知道这答案。
  Someone wants to see you. 有人想见你。
  Is there anything in the box?箱子里有什么东西吗?
  There is a lot of milk in the bottle. 瓶子里有很多奶。
  （5）“many a +单数名词”作主语
  “many a、(很多)/more than one(不只一个)+单数名词”作主语时，谓语动词用单数形式。
  Many a student has been to Beijing. 很多学生去过北京。