Tina and Sarah are from cuba.（改为否定句）为什么不能写成no,they,aren't

Tina and Sarah are from cuba.（改为否定句）为什么不能写成no,they,aren't Tina and sarah are from England改为否定句 Tina and Sarah are from England怎么改为否定句 They are lucy and Lily(改为否定句)They aren't Lucy or Lily 为什么不是改 1、am jack.(改为一般疑问句） 2、They are from Cuba.(改为否定句） Ther ______ Maria and Ann aren't from Japan._____ are from Cuba They.are.from.Cuba改为否定句!She.is(Kate)对括号部分提问大神们帮帮忙 are these apples 的否定回答是no,they aren't还是no,these aren't. They are from Beijing改为否定句 Are they from China?（否定回答） They are good students.(改为否定句） He These are my keys.They aren't( )( ).改为同义句 No, they aren't.改为单数形式