Would 这是重要吗 also be correct? If not, why?
“这是重要吗" got denied on 2019-06-10. Didn't report, because I'm not certain. Came for this question as well.
I think we can't use 是 because 重要 is an adjective, if I'm right.
With 是 it would probably have to be 这是重要的吗
As of 12-11-2020
What is the reason that the adjective zhongyao doesn't seem to require hen before it like most Chinese adjectives?
Actually, it's not required to include 很, which is the common linkage between noun and adjectives. As long as you are not including extreme before the adjective, the sentence still makes sense without 很.
There is a 吗 at the end so the 重要 is not standing alone.
Can it also be 这重要吗?
Yes, that was just accepted for me.