need to do和need doing的区别

need to do 表示主语与need这个动作是主动关系，\r\n如：I need to go now.我现在需要离开了。\r\n而need doing sth表示主语与need这个动作是被动关系，\r\n例如：The windows need cleaning.窗户需要清扫。

need to do表示主动
need doing =need to be done
是表示被动

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
二、
need to do 一般主语是人
need doing 一般主语是物
三、
need to do sth 是必须做某事 但还没做过 、
need doing sth 是 需要做某事 已经做完了。

need to do需要去做的事情；
need doing是需要某东西，doing是动名词表现形式

need to do是需要做某事needdoing是需要去做某事

mend 的过去式是mended