His son learns piano guitar.
To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.
-There were already five people in the car, but they managed to take me as well. -It ______ a comfortable journey. A. can’t B. shouldn’t be C. must have been D couldn’t have been
Sorry I’m late. I ______ have turned off the alarm clock and gone back to sleep again.
I’m surprised that he ______ in the match.
Haven’t I told you that you ______ have the answer tomorrow morning?