the boys are [singing and dancing]【对划线部分提问】he,s playing basketball in the playground改复数
问题描述：
the boys are [singing and dancing]【对划线部分提问】he,s playing basketball in the playground改复数
答
What are the boys doing?
They are playing basketballs in the playgrounds.
答
What are the boy doing ?
They're playing basketballs in the playgrounds
答
What are the boys doing?
They are playing basketball in the playground.