改成单数句子怎么改Are they Japanese buses?

改成单数句子怎么改Are they Japanese buses? they are on sofa 改成单数句子 They are bananas怎么变为单数句子 those,are.his.boxes改成单数,怎么改 你好、Are they student 改为单数句怎么改? They are some good dictionaries.改为单数句怎么改 把they are boxes.改为单数句怎么改 They are orange schoolbag改为单数句,怎么改啊! They are old monkeys?改成单数句 they are改成第三人称单数形式 They are my books.改成单数 they are改成第三人称单数形式 they are chinese boys改成单数 Are they mice?改成单数句 are they ruler 改成单数句 They are old ladies.(改为单数句子)怎么做? 这个句子怎么变为单数形式?They are good children. they are some apples 改单数：---------- ------------- ---------------