精选优质文档-倾情为你奉上现在进行时专项练习一.按要求改写句子1. The boy is playing basketball.否定句:_The boy is not playing basketball._一般疑问句:Is the boy playing baskeboll ?_肯定回答:Yes, he is._否定回答:No, he is not._对“is playing basketball”提问:What is the boy doing ?_对“ The boy”提问: _Who is playing basketball ?_2. They are singing in the classroom.否定句:They are