e动词are am is 后面的动词要使用ing形式.
如：
she is reading a book.
动词做主语,也要加ing如：
watching too much TV is bad for our health
详细的动词-ing的用法?以下的句子为什么用动词-ing?
e动词are am is 后面的动词要使用ing形式.
如：
she is reading a book.
动词做主语,也要加ing如：
watching too much TV is bad for our health