用am, is 或are填空。
(1)I______ a girl.  You _______ a boy.
(2)Daming ________ from China. Amy and Sam _______from England.
(3)She ________ jumping. He ______ running.
(4)My brother _______ playing football with his friends. They ______ happy.
(5)We _______rowing a boat.
(6)What ______you doing?   I ______ skipping.
(7)Lingling and I _______ doing taijiquan.