单数句是啥?These are our broths(改为单数句） _____ ______ my brother.应填

单数句是啥?These are our broths(改为单数句） _____ ______ my brother.应填 These are my pencils改为单数句 that is my brother改为一般疑问句 are these books 改为单数句 These are boxes. (改为单数句） These are oranges.(改为单数句） these are our apples改为单数句子 These are our apples改为单数 Are these my new shoes?改为单数句 These are our sheep. （改为单数句子） These are my photos.改为单数句子 these are my oranges(改为单数句式) These are my notebooks改为单数