1．看法（OPINION）：anticipate，be supposed to，believe，calculate， expect，figure (infml，AmE),imagine, reckon (infml，esp, in AmE)，suppose，think:
Eg. I don't believe I've met you before.
("I believe I haven't met you before.")
Eg. She didn't imagine that we would say anything.
("She imagined we wouldn't say anything.")
Eg. He didn't expect to win.
("He expected not to win.")
2．感觉(PERCEPTION) appear，seem，feel as if，look as if，sound as if (后三个动词也作infml，esp， in AmE，其中用like来代替as if）：
Eg. It doesn't seem that we canget our money back.
"It seems that we can't get our money back."
Eg. The baby doesn't appear to be awake.
("The baby appears not to be awake.")
Eg. It doesn't look like it's going to rain.
("It looks like it isn't going to rain.")
I wish you were here，then I think I should not feel like this.
2．母句中添加情态动词can't mustn't wouldn't时：
I can't believe that they are married.
You mustn't think he's stupid.
I wouldn't have imagined that Sandra would be here.
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。
I should have thought sometimes you couldn't help thinking of the past.
I think you ought not to walk at night alone，Mrs. Moore.
I think you need not be impolite to her，as well as to her son.
"I think the angel are not at all in heaven." Mr.Esmond said."
4. 由于not just... but， just not... enough，not much, not quite等以not为核心的副词短语的影响，也不便把否定拿到动词的前面去：
I think I'm just not smart enough to make any sense out of for you.
"You think she's not much like you? Brerald asked.
But I think that Elizabeth was not quite so certain of it as I.
句中含有no, never, nothing, nobody等的不定词时：
I should think you never have seen many.
I thought it explained nothing.