They are his uncles 改为单数句

把They are my uncles.改为否定句 They're my uncles.改为单数形式. they are my uncles改为否定形式 They are his friends改为单数形式 they are my uncles 改否定句 They are my uncles.改为否定句 This is not my sister.缩句 These are his brothers 改为单数句 These are his watch.改为单数句 those are his sistexs 改为单数句 they are orange sweaters 改为单数句 They are American teachers(改为单数句) Are they women doctors? 改为单数句