英语中,为了避免重复,常用it,that和so作代用词(substitute)来代替已陈述的事物,即代替上文中的句子、不定式或名词(短语).现就这三个代用词在代替句子、不定式或名词(短语)时的区别分述如下: 1.代替句子一般地说,当它们代替宾语从句时,三者可以互换. ——Whosaid thatIwascrazy?谁说我古怪? ——Isaid it/so/that.句中it/that/so指代名词性从句. In English, in order to avoid repetition, it, that, and so are often used as substitutes to replace what has already been stated, ie instead of sentences, infinitives, or nouns (phrases) in the preceding sentence. The distinction between sentences, infinitives, or nouns (phrases) is as follows: 1. Substitute sentences In general, when they replace the object clause, the three can be interchanged. - Whosid that Iwascrazy? Who said that I was weird? - Isaid It/so/that. It/that/so in the sentence refers to a subordinate clause.