Please come to my party if you ____ free tomorrow.

A. will          B. will be        C. were          D. are

Please come to my party if you ____ free tomorrow.

1. A.
   will
2. B.
   will be
3. C.
   were
4. D.
   are

–Bob ________ come to my party. He has to go to his guitar lesson.

　 A. can B. can't　 C. mustD. mustn't