Who's going to look after the dog?请问,为什么要用is,go已经是谓语动词了,还要BE动词吗?
问题描述：
Who's going to look after the dog?请问,为什么要用is,go已经是谓语动词了,还要BE动词吗?
答
现在进行时必须用be动词
be going to