it is a key hes is a bay 怎么改成复数

it is a key hes is a bay 怎么改成复数 那：it is a pen怎么改成复数形式 It is a key a key提问 This is a key.(变为复数) it is a mouse (改成复数句） It is a bowl of rice 改成复数句 英语复数形式it this a book,it is a pen,there is a book,以上改成复数形式.th This is a sheep怎么改成复数句?急 把英文句子改成复数what is it?it's a mirror?it's a bus?请该为复数,怎么改 Is it your key?改为复数 It is a beautiful is waiking怎么改成一般 疑问句? This is a key.(改为复数形式）