过去式 I thought you were a girl. I thought you went to Venice. I thought it was forever. I thought I lost you. I thought you might like them. I thought I saw you in the library.【这个句子发生的时间是一天里面,用过去式,意思是“我以为我(刚刚)在图书馆遇见你了。”】
【如果是发生在前天,要用完成时态,比如:I thought I have seen you yesterday.我以为我昨天已经看见你了。】
I think I saw you in the library yesterday.这个是“我觉得/想我昨天在图书馆看见你了。”(是现在想着昨天的事情,所以想是一般时态,看见是过去时态) I thought I saw you in the library.这个是“我以为我看见你在图书馆。(隐藏意思:现在知道你不在那)”(想的动作刚过去不久,看见也是今天之内,所以我认为这两个动词可用过去时态) I thought I have seen you in the library yesterday.这个是“我以为我昨天在图书馆看见你了。”(想的动作是刚刚,看见的动作是昨天发生,所以想用过去时态,看见用完成时态)