题目内容：

It is great fun playing with him分析

优质解答

It在句中作形式主语,真正的主语是动名词短语playing with him.这个句子也可以这样说,Playing with him is great fun.但英语中有时习惯用it做形式主语,这样句子显得不那么头重脚轻.例如,It's so nice to meet you.It'...