be busy后接不定式还是现在分词

be busy后接不定式还是现在分词

be busy后习惯上要接现在分词，不能接不定式。如：

She’s busy writing letters. 她正忙着写信呢。

She was busy preparing lessons. 她忙于备课。

He was busy packing, for he was leaving that night. 他那时正忙着打点行李，因为那天晚上他就要走了。

顺便说一句，busy用作动词时，通常用于busy oneself doing sth，其中的现在分词也不能换成不定式。如：

He busied himself cooking the dinner. 他忙着做饭。

She busied herself tidying up her desk. 她忙着收拾她的写字台。

注：有时可在现在分词前加上介词in，这样一来现在分词就变成了动名词。如：

She was busy in preparing lessons. 她忙于备课。

He busied himself in cooking the dinner. 他忙着做饭。