英语正在进行时的问句怎么变改成问句形式，是怎么构成

你问的是现在进行时的问句改法?
For an example as below:
原句：The biggest problem is getting them close enough to the wall.
改为问句后：Is the biggest problem getting them close enough to the wall?
Link Verbs such as be group,is are.
if it is good for you pls vote me.

具体点问

问句是“what are you doing ?”
答句是“I do my homework.”或者是其他的，但是前面不能改必须是：I do............... .后面就接动词。