the table?
［正］a doctor will be here in a minute, sir!
［誤］a doctor will be in a minute, sir!
［正］there will be a doctor here in a minute, sir!
［正］how many books are in the bookcase?
［正］how many books are there in the bookcase?
［誤］what is there on the floor?
［正］what is there to talk about? 