《A Family Picnic》Family and Home PPT下载
《A Family Picnic》Family and Home PPT下载第2页

 温故互查

Make up a dialogue like the following: A : What are you doing? B : I am +V-ing . A: What is he/she doing? B: He/She is + V-ing. A: What are they doing? B: They are + V-ing.?