The shoes need to be washed.它的同义句The shoes need washing.为什么need不加s?它不是被动的么?

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Theshoesneedtobewashed.它的同义句Theshoesneedwashing.为什么need不加s?它不是被动的么?Theshoesneedtobewashed.它的同义句Thesh

The shoes need to be washed.它的同义句The shoes need washing.为什么need不加s?它不是被动的么?
The shoes need to be washed.它的同义句The shoes need washing.为什么need不加s?它不是被动的么?

The shoes need to be washed.它的同义句The shoes need washing.为什么need不加s?它不是被动的么?
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.