1、多個人稱代詞的排列順序
　　①you and I
　　②he and I
　　③you and he
　　④you, he and I
　　⑤you, they and we(情況多)
　　2、It 的用法
　　① 代替this, that
　　That’s a book, isn’t it ?
　　② 做某動作的人或嬰兒
　　---Someone is coming. Who can it be ?
　　---It may be Jack.
　　It’s a lovely baby. Is it a boy or a girl?
　　③表示時間、距離、自然現象
　　It’s 20 miles to (from) Paris.
　　3、簡略回答中用so, not, it 的情況
　　①肯定答語中，下列動詞后面常用so:
　　think, hope, believe, I’m afraid, It seems (appears), etc.
　　---Is it true that he had a heart attack?
　　---I’m afraid so. / I believe so. / It seems so.
　　②否定答語中用not:
　　---Has Anne got into university?
　　---I’m afraid not. / I think not. / It seems not.
　　③協力動詞中也可以用not…so:
　　believe, think, suppose, expect, etc
　　I don’t believe so. / I don’t think so.
　　④do代替上下文動詞，并且表示一個已完成的動作時，
　　do后常用so / it:
　　---Please lay the table.
　　---I’ve just done so (it).