They are my friends.
否定句 They are not my friends
一般疑问句 Are they your friends
变单数 He/she is my friend
They are not my friends
变一般疑问句 Aren't they your friends
怎么把复数的英语句子改为一般疑问句,否定句和陈述句,怎么把复数的否定句子改为一般疑问句.陈述句
They are my friends.
否定句 They are not my friends
一般疑问句 Are they your friends
变单数 He/she is my friend
They are not my friends
变一般疑问句 Aren't they your friends