用所给词的适当形式填空。 

1. John __________(play) football next Sunday.

2. —Will you go swimming with me tomorrow?

    —If I __________(be) free, I will.

3. They're singing and dancing ____________ (happy) .

4. Don't make noise, my father __________ (sleep) .    

5. What ____________ you ____________(do) just now?