John went to the hospital alone. If he_______ me about it, I would have gone with him.

       you be interested, I’ll tell you the whole story.

--- Have you told him we have changed the plan?I _____ have, but I haven’t done it yet.

—It’s hard to believe that Jack should have fought with the policeman.—Yes. If one ____ ask for trouble, it can’t be helped.

 "You  ____be so tired that you had to stop to rest．"