根据语法的惯例，think, suppose, believe, imagine, guess 等后的宾语从句如果是否定句，要把否定转移到主句的think等动词上，这叫做“否定前移”或“否定前置”。如：I think you can not go there by bus. (误)I don’t think you can go there by bus.（正） 我认为你不能乘坐公共汽车去那儿。① think 是完成时态或完成进行时态时；如：I have been thinking that we should not take his advice.我一直认为我们不应该听他的话。② think 是一般过去时或过去进行时态时；如：We thought that this book was not worth reading.我们认为这本书值得一读。③ think 前有副词修饰的时候；如：I almost think you are not my son’s teacher.我差点认为你不是我儿子的老师。④ think 前有do, did 等词强调时；如：I do think that she is not pretty at all.我确实认为她不漂亮。⑤ think 用于一般疑问句或特殊疑问句中；如：Do you think he will not join the Party?你认为他不会入党吗？Why do think we can’t beat you?你们怎么认为我们打不赢你们呢？⑥ 当think后的宾语从句中含有no, never, nothing, nobody等否定词时；如：I think she may have nothing to do today.我认为她今天没事干。⑦ 当 think 用作插入语时；如：Your sister ,I think, is not a friendly gay.我认为你妹妹不太友好。⑧ 当think后的宾语从句中含有not at all, not a little, not enough, can’t help doing 等固定词组时；如：I think you can’t help laughing when you hear the joke.我认为你听到这个笑话时会忍不住笑的。⑨ 当think和另一个动词构成并列谓语时；如：I think and hope you won’t feel sad even if you lose the match.
我们认为也希望，即使您们输掉了比赛，你们也不会伤心的。⑩ 当think用作虚拟语气的谓语had thought, 表示“本来认为……”时；如：I had thought that he hadn’t come here.
我本来认为他不来了呢。
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