How come you stepped into the lab with your shoes on? You’re ________to take them off before you enter it. I told you so.
“Do you think he is lazy?” “I _________ so once, but I don’t now.”
Mike is often absent from class.” “Tell him he _________ answer for it if he goes on behaving like that.”
He tried to ________ in Japanese.
---- Is Mary coming to the concert? ---- I think ________.