-Will you come to the dinner party? 你会来晚宴吗？-I won't come unless Jenny is invited. 我不来，除非珍妮也受到了邀请。A.can be invited 珍妮能够受到邀请，能够不代表已经被邀请了，可能未成事实。B.is invited 已经被邀请了，已成事实。
A 中can表示某种能力，比如I CAN SWIM
