Something terrible _________ if he didn’t come to the bar as he always did.

According to the school rules, if a student _________ happen to damage something by accident,he/she should report it to a teacher or the office immediately.

I am fond of my sister but she has one serious shortcoming. She _________ be really stubborn.

— ______ you sing the English song?— Yes, I can. But only a little.

The light is on in Mr. Green’s room. He _______ be at home.