I did all I could(do) to help the poor

I did all I could(do) to help the poor
why the "do"behind "could"can be left out?
ayong777888999 1年前 已收到1个回答 举报

叶子爱大春 幼苗

共回答了11个问题采纳率:90.9% 举报

I could 做修饰语,所以不能按照情态动词后面+原形来判断.
省略后相当于 I did all …… to help the poor(to 表目的) .

1年前

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