简单初级的讲：

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.

具体的说：

need to do sth实义动词

need doing sth,表示被动

人＋need ＋to do

物＋need ＋doing

物＋need ＋to be done

请看下面的例子：

1．We need to collect the parcel before we leave for England．去英国之前,我们需要收拾好行李.

2．We need to tell him the truth．我们需要告诉他真相.

3．My car needs repairing．我的汽车需要修理.

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