在什么时候英文要加ing
问题描述：
在什么时候英文要加ing
答
1、有be动词(am、is、are、was、were)的时候
2、有介词时（介宾结构）
3、动词做名词时
答
介词语后面
答
动词后面要加，如：
playing teaching talking catching booking cooking studying staying saying keeping
writing hoping arguing having living
coming noticing dancing taking waking
swimming running stopping getting putting chatting fitting pitting kidding beginning···
答
介词语后
答
多了
总之来说就是需要名词时 （动词名词化）,作表语 如 seeing is believing
许多动词加ing就可以当名词了 如maping,