is和does的区别举例说明he is doing his homework.就这个句子来说改为一般疑问句用does还是is.does is都用于现在进行时吗

分类: 作业答案 • 2021-12-19 16:28:07

问题描述：

is和does的区别举例说明
he is doing his homework.就这个句子来说改为一般疑问句用does还是is.does is都用于现在进行时吗

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