be busy 后面加动词的什么形式

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bebusy后面加动词的什么形式bebusy后面加动词的什么形式bebusy后面加动词的什么形式bebusy后面加动词的ing形式,即doing形式bebusydoingsth.忙于做某事加动词ing

be busy 后面加动词的什么形式
be busy 后面加动词的什么形式

be busy 后面加动词的什么形式
be busy 后面加动词的ing形式,即doing形式

be busy doing sth. 忙于做某事

加动词ing形式
be busy doing sth. 忙于做某事

be busy with sth/n
eg. He is busy with his homework.
be busy doing sth
eg. He is busy doing his homework.

to do

be busy doing

be busy with sth
be busy doing sth

doing be busy doing /to do sth be busy doing sth.