问题描述:
关于动词过去式与did
这句话
I didn't go to bed until my father came back yesterday
不是说助动词后用动词原形吗?为什么come成了过去式?
这句话
I didn't go to bed until my father came back yesterday
不是说助动词后用动词原形吗?为什么come成了过去式?
问题解答:
我来补答展开全文阅读