1. 我不认为他是个好医生。2. 我认为他不是个好医生。哪个正确呢?2是正确的。那么1的错误在哪儿呢?这就是“否定转移”在作怪。这一语法现象在英语中特别常见，它是将语义上属于从句（一般为that clause）的否定词转移到主句中去。允许否定转移的主句动词在语义上可分为两类：
一、表示看法的动词：be supposed to, believe, expect, imagine, suppose, think等。如：
1. I ____ I_____ you before.
A. think; haven’t seen
B. didn’t think; have seen
C. didn’t think; didn’t see
D. thought; not see
2. She _____ that we ____ anything.
A. didn’t imagine；would say
B. don’t imagine; say
C. doesn’t imagine; would say
D. would imagine; would say
（Keys: 1. B 2. A）
二、表示感觉的动词：appear, seem, look like, feel as if, look as if, sound as if等。如：
1. The baby ____ appear to be awake.
A. don’t B. didn’t
C. doesn’t D. could
2. It ______（看起来） like ______（天不会）going to rain.
（Keys: 1. C 2. doesn’t look；it’s）
在以下特殊情况中，即使有允许否定转移的动词，也不能将其否定转移到主句中。
1. I think是插入语，可看作与其他部分无关时。如：
I wish you were here, then, I think, I should not feel like this.
2. 主句中有情态动词can’t, mustn’t, wouldn’t等时。如：
I can’t believe that they are married.
You mustn’t think he’s stupid.
3.由于cannot help doing, ought not, need not, not at all等短语的关系而把I think隔离时。如：
I think you ought not to walk at night alone, Mrs.
“I think the angel is not at all in heaven.”
4.由于受not just…but, just not…enough, not much, not quite等以not为核心的副词短语的影响，也不便把其否定转移到主句中。如：
I think I’m just not smart enough to make any sense out of for you.
But I think that
5. 句中含有no, never, nothing, nobody等否定词时。如：
I should think you never have seen many.
I thought it explained nothing.
