he is very busy(writing)his papers.he is far too busy(to receive)callersbusy后面只能加doing的形式吗?那后面的空为什么是to do的形式呢?求讲解

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he is very busy(writing)his papers.he is far too busy(to receive)callers
busy后面只能加doing的形式吗?那后面的空为什么是to do的形式呢?求讲解

be busy doing sth忙于做某事
be busy with sth忙于某事
too+adj/adv to do sth 太(怎么样)而无法做某事
He is far too busy(to receive)callers.
他太忙了,而无法接电话.

be busy (with) sth 忙于做某事
too .. to固定搭配后面加原形
太、、以至于、、