问题描述:
请问第三人称过去式是用did还是用does?
1.She does not konw London very well 2.He did nor understan
2.He did not understand English
请问这两句话都是过去式 为什么一个用does 一个用did?可以互换吗?
1.She does not konw London very well 2.He did nor understan
2.He did not understand English
请问这两句话都是过去式 为什么一个用does 一个用did?可以互换吗?
问题解答:
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