are they apples?改为单数形式

they are apples改为单数 把They are apples.改为单数句 are they apples?改为单数形式 what are they?they are apples改为单数句 she is nurse (改为复数）What are those over there?(改为单数）These are apples and those are pineapples(改为单数)They are waitresses (改为单数)They are oranges (改为单数)They are apples (改为单数) Are those apples 改为单数 Does he like apples?改为单数形式.Are they old sweather?改为单数形式 These are apples改为单数形式 these are apples 改为单数形式 are these apples?改为单数形式 These are our apples改为单数 these are our apples改为单数句子 they are some apples 改单数：---------- ------------- --------------- they are waitresses(改为单数 They are picking apples.(改为一般现在时) these are apples and those are pineapples(改为单数 They have many apples.（改为单数形式） There are Some apples on the table (改为单数句子)