What do you mean, there are only ten tickets? There _________ be twelve. 

-______ I do the laundry first?-No,you _____. You can do your homework first.

It_____ have been Tom that parked the car here, as he is the only one with a car.

—Will you read me a story ,Mummy?                               --OK.You________have one if you go to bed as soon as possible.

I ______ worry about my weekend—I always have my plans ready before it comes.