什么叫做句型转换?解释之后麻烦做几道题.谢谢.

题目

什么叫做句型转换?解释之后麻烦做几道题.谢谢.
我碰到了几道题,各位大师帮我一下吧:
I'm having a swim in the pool. _____________
He has lunch at 2:00p.m.. ________________
We're having a Sherry party here. __________________
They had a good time yesterday. ___________________
She's going to have a haircut this weekend. ____________________
Does he have a bath twice a year? _____________________

答案

英语句型转化,就是把句子转化成另一种形式,原句意思基本保持不变.I'm （having a swim） in the pool.__swimming___________He (has) lunch at 2:00p.m.._____eats___________We're (having) a Sherry party here.__...