they are your sons改为单数形式

they are your sons改为单数形式 1-Are those your sons?(改为单数形式） 2-Are those his keys?(改为单数形式） 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 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 Are these your cousins改为单数形式