1.構(gòu)成時態(tài)
He is singing.他在唱歌。
He has arrived.他已經(jīng)到了。
Tomorrow will be the first day of autumn.明天是秋天的第一天。
2.構(gòu)成語態(tài)
He was sent to England.他被派往英國。
The children have been having a lot of run.孩子們一直玩得很開心。
3.構(gòu)成疑問句
Do you like college life? 你喜歡大學生活嗎?
Did you study French? 你們學過法語嗎?
Are the small animals kept in the cages? 小動物都關(guān)在籠子里嗎?
4.與not一起構(gòu)成否定
I don’t like him.我不喜歡他。
If it should not snow tomorrow,we would not leave.明天不下雪,我們就不走。
5.強調(diào)謂語
I do love you.我真的喜歡你。
Do come to my birthday party.一定來參加我的生日宴會。
I did go there.我確實去那兒了。
6.構(gòu)成倒裝句
Never did I hear of such a thing.我從未聽說過這樣的事情。
Under no circumstances will I lend money to him.無論如何我也不會借錢給他。
Only when we begin our college life do we realize the importance of English.
只有在開始大學生活時我們才認識到英語的重要性。
7.替代實義動詞
He made a mistake the other day and he did the same mistake again yesterday.
幾天前他犯了一個錯誤,昨天他又犯了相同的錯誤。(did代替made)
— She loves roses most.她最愛玫瑰花了。
— So she does.她確實最愛玫瑰花。(does代替loves)