为什么What class are they having?不能是What class do they having?

Question

说明理由

Answer 1

are是be动词，后面不能加动词原形，如果用do的话，就是What class do they have.

Answer 2

What class are they having? 意思是他们正在上什么课？What class do they having?因为do是助动词，后面的having应用have

Answer 3

having 一般与be动词连用；而have一般与do连用；

What class are they having?=What class do they have?本回答被网友采纳

Answer 4

What class are they having? 意思是他们正在上什么课？