【初中生必会英语知识】think、believe、guess、suppose、imagine、expect的用法

当主句的谓语动词是think，believe(相信),guess/suppose(猜想),imagine(想像),expect(期待)等表示心理活动的动词,宾语从句中的否定词通常要前移到主句中,即否定主句动词,这种现象叫做“否定转移”。(也就是说,主句虽然是否定形式,但意义是肯定的;宾语从句虽然是肯定形式,但意义却是否定的。)

我们可以利用串联记忆法,用一句话把上面的几个词串联起来:

我猜想(guess/suppose),他相信(believe)自己具有丰富的想像(imagine)力。

你认为(think)对吗?我期待(expect)着你的回答。

I don't think (that) he will be able to come.我认为他不会来了。

We don't suppose (that) she can do that.我们认为她干不了那件事。

I believe it will be fine tomorrow, won't it?我认为明天是晴天,不是吗?

特别警示:

1.主句的主语是第一人称,变反意疑问句时,反意问句的主语、谓语要与从句一致。

I don't believe he is a student, is he?我认为他不是一个学生,是吗?

We don't think she will come, will she?我们认为她不会来,是吗?

I think he likes English, doesn't he?我认为他喜欢英语,是吗?

2:如果主句的主语是第二、三人称时,反意问句应与主句一致。

He doesn't thinks he can go with you, doesn't he?他认为他不能跟你去,是吗?

She thought she could do that thing this afternoon, didn't she?她原以为她今天下午可以干那件事,是吗?

You believe you are sure to get the job, don't you?你相信一定能得到这份工作,是吗?

3.主句中有情态动词时不存在否定转移的现象。如: 

I can't believe you failed in this English exam.我不相信这次英语考试你没及格。

4.当从句中有 can't help doing 时不存在否定转移的现象。如: 

I suppose that everyone can't help laughing at your idea.我猜想大家会禁不住为你的想法发笑。

5.当从句中有 not…until 时不存在否定转移的现象。如: 

I believe he won't come until late in the evening.我相信他很晚才能回来。

6.当从句中有 needn't do sth.时不存在否定转移的现象。如: 

I think you needn't do it again. 我认为你不必再做了。

7.当从句中有 not do sth. yet 时不存在否定转移的现象。如: 

I suppose they haven't come back yet.我猜想他们还没回来。

九、doubt 后宾语从句中连接词的选用

1.主句是肯定句时,用 whether,if,when,what 等连接宾语从句。 

I doubt whether he'll come.我看他不一定会来。

2.主句是疑问句、否定句时,用 that 连接宾语从句。

Does anyone doubt that it is so? 它原如此,有人怀疑吗? 

Do you doubt that he will succeed? 你怀疑他会成功吗?

3.doubt 用作名词时,后跟同位语从句,肯定句用 whether 引导(不能用 if),疑问句、否定句用 that 引导。如:

There is some doubt whether she can win the match.她能否赢得这场比赛还有些疑问。

There is no doubt that you will be warmly welcome.你们毫无疑问会受到热烈的欢迎。

I have no doubt that he will pass the examination .我确信他会通过考试。