當(dāng)句子中有明顯的過去時(shí)間狀語，可根據(jù)上下文注意：實(shí)義動(dòng)詞作謂語時(shí)，一般疑問句要加助動(dòng)詞did，否定句加didn’t，加了助動(dòng)詞之后，原來的動(dòng)詞要用原形。如：He went shopping yesterday.Did he go shopping yesterday?

到底何時(shí)使用did？

did和其它助動(dòng)詞一樣，本身無意義，自己不能獨(dú)立作謂語，只能和其它主要?jiǎng)釉~一起構(gòu)成謂語，用于構(gòu)成一般過去時(shí)的否定句和疑問句，當(dāng)然也常常用于代替上文中的行為動(dòng)詞的過去式。如:

I didn't go to school last Sunday. 上周日我沒上學(xué)。

Did you buy a new pen yesterday? 昨天你買了枝新鋼筆嗎？

did身后的動(dòng)詞到底用什么形式？

有的小朋友總不注意did身后的動(dòng)詞用什么形式，在否定句和疑問句中，

did身后的動(dòng)詞必須用原形。 “他昨天沒有在家吃午飯?！?/p>

[誤] He didn't had lunch at home yesterday.

[正] He didn't have lunch at home yesterday.

3. 我能用be動(dòng)詞代替嗎？

不管怎么說，含有行為(實(shí)義)動(dòng)詞的一般過去時(shí)的肯定句變成否定句或疑問句時(shí)，不能用be動(dòng)詞，必須用到did！含be動(dòng)詞的句子構(gòu)成否定句或疑問句都絕不會(huì)讓did露面！

例句：They went to the park last week. (改為否定句)

[誤] They weren't go to the park last week.

[正] They didn't go to the park last week.