现在进行时练习
I. 按要求改写句子
1. The boy is playing basketball.
否定句：____________________________
一般疑问句：_________________________
肯定回答：__________________________
否定回答：__________________________
对“is playing basketball”提问：__________________________
对“ The boy”提问：__________________________
2. They are singing in the classroom.
否定句：____________________________
一般疑问句：_________________________
肯定回答：__________________________
否定回答：__________________________
对“are singing ”提问：__________________________
对“ in the classroom”提问：__________________________