剑桥初级英语语法 Day3

1. UNIT 11 - UNIT 15

1.1. 动词一般过去式变形

掌握规则动词和不规则动词的过去式变形。前者见附录 5 后者见附录 2-3。

1.2. 现在完成时

掌握规则动词和不规则动词的过去分词形式。

规则动词的过去分词为-ed 形式（与过去式相同）：
clean -> I have cleaned finish -> we have finished

不规则动词的过去分词有时与过去式相同而有时则不同（参见附录 2 与附录 3）：

相同：    buy -> I bought / I have bought    have -> he had /he has had
不同：    break -> I broke / I have broken    see -> you saw / you have seen
         fall -> it fell / it has fallen    go -> they went / they have gone