those are my pencils 改为单数句子

those are my pencils 改为单数句子 These are my pencils改为单数句 Where are my pencils 改为单数形式 Those are my friends 改为单数句 those are my brothers.改为单数句 Those are books 改为单数句子 those potatoes are bad.改为单数句子 Those are my sisters改为单数形式是? Those are my shoes.怎样改为单数句? 将："Those are English books."改为单数句子 Those are eynscrs咋改为单数句子啊!急啊! Those T-shirt are black (改为单数句子)