a ). be动词过去式的句式。

否定句:是在was / were后面加not，was not (wasn't)/were not (weren't)。

一般疑问句: 是把was / were提前并放到句首，要求首字母要大写。

b ).实义动词过去式的句式　 如：They had a good time yesterday.

否定式：主语+did not( didn't )+动词原形+其它。如：They didn't watch TV last night.

一般疑问句：Did+主语+动词原形+其它？

肯定回答：Yes，主语+did.　　　　　 否定回答：No，主语+didn't.

如：Did they have a meeting two days ago? Yes，they did. / No，they didn't.

特殊疑问句：特殊疑问词+did+主语+动词原形+其它？

如：What time did you finish your homework?

c ). 关于过去式的规则变化 : 可速记为"直"、"去"、"双"、"改"四字诀。

　 ①一般情况下在动词原形后直接加-ed。如：wanted，played。

　 ②以不发音的字母e结尾的动词，去掉e再加-ed。如：hoped，lived。

　 ③重读闭音节单词需双写最后一个辅音字母再加-ed。如：stopped。

　 ④以辅音字母+y结尾的动词变y为i，再加-ed。如：studied，worried。

d ) . 不规则动词的变化有许多，在这个单元中我们首先应记住以下几个：

1. go －went 　　2. take－took　 3. have－had 　　4. buy－bought 　　5. eat－ate 　　　

5. What else did you do? 　　　　　　　　　6. How was your day off?

4. Were there any sharks? No, there weren't any sharks; but there were some really smart seals.

3. Did you see any seals? 　　　Yes, I saw some seals.

2. Did you go to the zoo? 　　　No., I didn't. I went to the aquarium.

18. in the future “在将来” 19. none of them 一个都没有

16. see you soon盼望很快见到你　　　 17. come back from…　 从…回来

14. (on the) day off 　(因病或节假日)休息　　 15. a yard sale 庭院旧货出售

11. sleep late 睡过头　 12. go for a drive 开车兜风　 13. all day　 一整天

10. at the end of …在…结束;在…末尾 → at the beginning of…