Don't throw away the waste paper.It needs

Don't throw away the waste paper.It needs

need to do 需要做某事
need doing 是需要被做有被动的意思
如;I need to wash my clothes.
My clothes need washing.
need doing = need to be done
I need to mend my bike.
My bike needs mending.追问need to do need doing都什么时候用能详细说下吗谢谢！追答need 既可以作为实义动词,又可以用作情态动词.
先看情态动词的用法,只用于疑问句、否定句以及暗含某种否定含义的肯定句中,没有词形的变化.如：Need I go before ten o'clock?Yes,you must/No,you don't have to/needn't
you needn't be rude about it
用作实义动词时,后面接“to do”,表示需要做某事；后面接“doing "表示被动含义,即主语需要被...
如：He needs to water the flowers
your hair needs cutting
简单来说： 主语是人的情况下用to do，是物的情况下用 doing；这只是我自己的理解，希望对你有帮助。追问谢谢你

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