——What are they?——They are buses.怎么改为单数形式
——What are they?——They are buses.怎么改为单数形式
What are they?They are buses改位单数形式
they are English books.(改为单数形式)
They are his friends改为单数形式
They are Chinese【改为单数形式】
are they apples?改为单数形式
they are your sons改为单数形式
they are nurses改为单数形式
改为单数形式They are women teacher?
They are English cars.(改为单数形式)
are they american students?改为单数形式
they are old computers改为单数形式