he is piaying football on the playgound变否定句和疑问句
问题描述：
he is piaying football on the playgound变否定句和疑问句
答
he is not playing football on the playgound
is he playing football on the playgound?
答
he is piaying football on the playgound
变否定句
he isn't piaying football on the playgound
疑问句
Is he piaying football on the playgound?
答
he isn't piaying football on the playgound
what is he doing on the playgound?
答
He isn't playing football on the playground
Is he playing football on the playground?
答
否定句：He isn't playing football on the playgound
一般疑问问句；Is he playing football on the playgound?
答
He isn't playing football on the playgound.
Is he playing football on the playgound?