The Ai you used is "to love" incorrect Ai im afraid
I tried 弟弟爱吗？ And it was marked wrong...is there any reason why this is incorrect?
It's a bit confusing. Wouldn't it be more correct to say 弟弟矮吗？there was no ma option though. I don't really get why it is 矮不矮
You can ask a question like this by essentially saying "is he short or not short?", And then you don't use 马.
the structure "verb + 不 + verb" (or "adj. + 不 + adj.") has the same meaning as "sentence + 吗". So feel free to use both