1、I think the answer's right but I'm not absolutely sure about it.
我认为这答案是正确的,但是没有绝对的把握.
2、I think I've met him before,but I wouldn't swear to it.
我好像见过他,只是不敢肯定.
下面这句也有I think.but ,但不是一样的哦!
I think there can be but one outcome to this affair.
我认为这件事只可能有一种结局.