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

貌似一楼的回答不是很正确。
举个例子来说：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
希望对你有用！

1.The girls are playing games.
一般疑问句：Are the girls playing games?
否定句:The girls are not playing games.
陈述句为例句
2.The girls are not playing games.
一般疑问句:Are the girls not playing games?
陈述句:例句

1.There are some flowers in the vase.
一般疑问Are there any flowers in the vase?
否定There aren't any flowers in the vase.
2.表示请求用some Would you like to have some tea?
3.All of us like havving a picnic.
一般疑问Do all of you like having a picnic?
否定None of us like having a picnic.

累死~