The shoes need to be washed.它的同义句The shoes need washing.为什么n

因为shoes 是复数,所以用不单三形式,所以不加s,因为need 有两种用法,need to do something,need doing,所以the shoes need washing 是对的.因为鞋子是被洗,所以 the shoes need to be washed 要用被动语态.