These shoes need()at once为什么只能填mending不能mend 即二者区别?能填写to be ment吗?

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These shoes need()at once为什么只能填mending不能mend 即二者区别?
能填写to be ment吗?

要么说
These shoes need mending at once.
这里need是相当于系动词.后面接表语.表语是名词或者形容词.所以mend要变动名词.
要么说
These shoes need be repaired at once.
这里need就是普通的动词.后接不定式.

mend 作为修理,名词就是mend
mending在英语里有其他的意思,参考柯林斯字典:
mending
词义:
Mending is the sewing and repairing of clothes that have got holes in them. (OLD-FASHIONED)
mending的意思是缝补衣物
-...

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mend 作为修理,名词就是mend
mending在英语里有其他的意思,参考柯林斯字典:
mending
词义:
Mending is the sewing and repairing of clothes that have got holes in them. (OLD-FASHIONED)
mending的意思是缝补衣物
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补充:可以用to be mended (ment不是mend过去式)

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need doing 是被动,某物需要被怎样,比如 The desk needs repairing.
need to do 是某人需要做什么,比如 I need to do the homework now.
以上两种情况下need都是行为动词。
need做情态动词时后面不跟不定式而是直接跟动词原形。 I need look after the kid.
所以你...

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need doing 是被动,某物需要被怎样,比如 The desk needs repairing.
need to do 是某人需要做什么,比如 I need to do the homework now.
以上两种情况下need都是行为动词。
need做情态动词时后面不跟不定式而是直接跟动词原形。 I need look after the kid.
所以你问的问题属于第一种情况!

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need后只接doging sth,这是固定搭配,表被动的含义。
或是接to do sth. 可以用to be ment的!

当need+动词的ing形式表被动