主语+[ ]+动词ing

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主语+[]+动词ing主语+[]+动词ing主语+[]+动词ing主语+[am/is/are]+动词ing构成现在进行时如:WhatareyoudoingIamlisteningtotheradio.

主语+[ ]+动词ing
主语+[ ]+动词ing

主语+[ ]+动词ing
主语+[ am/ is /a re ]+动词ing
构成现在进行时
如:What are you doing
I am listening to the radio.
主语+[ was / were ]+动词ing
构成过去进行时
如:I was doing my homework when my mother arrived home yesterday.
不明白的再问哟,请及时采纳,多谢!