Is your cat clean?(变成复数句子）

Is your cat clean?(变成复数句子） 把下列句子变成复数形式.It is your dictionary. Is she doing an experiment?（变成复数句子） he is my brother 变成复数句子 以下句子变成复数句Is this your ruler?yes,it is.It's his backpack.What 句型转换.1.Where is it?（改为复数句子） Where___ ___?2.The cat is sleepi what your nema is cat the of yellow 连成句子 Is this your knife 改为复数句子 1.Is your watch on the table?(变成复数形式） Is she your sister?怎么变成复数形式 This is a black cat.（改成复数形式） Is your food is clean?