Why we can omit "you" in imperial questions but not in other types of questions??
Hi reza, I have no idea what an "imperial question" might be, so I am unable to help. Are you sure the word is 'imperial' and not 'empirical'?
If by crucial you mean "Needed urgently because you need us to do your homework for you", then you might want to rethink. Asking your tutor might be the best way forward for you.
I suspected you meant to write "imperative". But imperatives are always statements, never questions, so I'm not sure that's what you actually meant to say.