is am are
所以你这里的几个句子是这样的:
I am doing housework
I am just...(just不是动词,不能充当谓语)
I make(make是动词,可以充当谓语)也可以说I am making...(making是make的现在分词,不能做谓语了)
这些都是一些简单的时态问题,多看看相信你就懂了!
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