they are waitresses(改为单数
they are waitresses(改为单数
They are waitresses.(改单数句) ____ is a waitresses.
they are apples改为单数
They are oranges 改为单数
they are English books.(改为单数形式)
They are his friends改为单数形式
they are orange sweaters 改为单数句
They are Chinese【改为单数形式】
are they apples?改为单数形式
They are American teachers(改为单数句)
Are they women doctors? 改为单数句
they are your sons改为单数形式