【用be动词的正确形式填空.1this()mymom2()youmyclassmate3he()agoodboy4theystudents.5.shetheirteacher.6how()tomfine.6maryandlily()friends.()youok?yes,iam】

　　用be动词的正确形式填空.1this()mymom2()youmyclassmate3he()agoodboy4theystudents.

　　5.shetheirteacher.6how()tomfine.6maryandlily()friends.()youok?yes,iam