一般时态,I often do my homework on weekend. Sometimes I do my homework at my friend's home. I always do my homework with my friend Tom.
过去,I used to do my homework at home. I did my homework yesterday. I often did my homework alone.
现在进行,I am doing my homework now. I am doing my homework with my friend. I am doing my homework with my teachers' help.
过去进行,一般将来,过去将来,现在完成,过去完成,
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