is busy with his work. 不填 is busy to .
be busy with sth. 是固定搭配，忙于做某事
填
is busy with
即
Every day Mr. Hand (is busy with 忙于) his work. He has little time to play with his son.
is busy with
The window 为主语 is opened 谓语动词（其中的is为“助动词”） by 介词 , me 宾语. by加me 构成 介宾短语作"方式状语”
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