these men doctors are very kind.改为单数句子

these men doctors are very kind.改为单数句子 These men are policemen.【改为单数句子】 are these men doctors 单数句 These firemen are very helpful.(改为单数句子） these men are doctor还是these men are doctors 1.These are men.（变单数句子） These are my photos.改为单数句子 these are our apples改为单数句子 变单数句子1those potatoes are bad.2there men doctors are vevy kin Are they women doctors? 改为单数句 These are our sheep. （改为单数句子） These are old chairs(改为单数句子）