Necessary Sentence

Are you comfortable?

Are they coming this evening?

Are they the same?

Are you afraid?

Are you allergic to anything?

Are you American?

Are you busy?

Are you coming this evening?

Are you free tonight?

Are you going to attend their wedding?

Are you going to help her?

Are you going to take a plane or train?

Are you here alone?

What do your parents do for work?

What does he do for work?

What does this mean?

What does this say?

What does this word mean?

What does your father do for work?

What happened?

What is it?

What is that?

What is the area code?