see sb done能换成see sb be done么？为什么need doing能换成nee 怎样鼓励人们去学习一门外语？
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1.
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2.
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need doing能换成need to be done是主动表示被动的一个词组，一般东西，或是事件在前面，表示被做；如 The car needs repairing=The car needs to be repaired
keep sb done 和keep sb being done，首先如keep the door closed，当中的closed已经演化成形容词了，而keep sb from being done 阻止什么被做
see sb done不能换成see sb be done，因为see sb +done固定搭配，see后面能接复合结构，seen是宾语补足语；但是不能接句子。
need doing能换成need to be done是主动表示被动的一个词组，一般东西，或是事件在前面，表示被做；如 The car needs repairing=The car needs to be repaired
keep sb done 和keep sb being done，首先如keep the door closed，当中的closed已经演化成形容词了，而keep sb from being done 阻止什么被做
see sb done不能换成see sb be done，因为see sb +done固定搭配，see后面能接复合结构，seen是宾语补足语；但是不能接句子。
need doing能换成need to be done是主动表示被动的一个词组，一般东西，或是事件在前面，表示被做；如 The car needs repairing=The car needs to be repaired
keep sb done 和keep sb being done，首先如keep the door closed，当中的closed已经演化成形容词了，而keep sb from being done 阻止什么被做
see sb done不能换成see sb be done，因为see sb +done固定搭配，see后面能接复合结构，seen是宾语补足语；但是不能接句子。
need doing能换成need to be done是主动表示被动的一个词组，一般东西，或是事件在前面，表示被做；如 The car needs repairing=The car needs to be repaired
keep sb done 和keep sb being done，首先如keep the door closed，当中的closed已经演化成形容词了，而keep sb from being done 阻止什么被做。
need to do、need do、need doing、neeed to be done的区别
need to do sth need do sth need doing sth neeed to be done 有什么区别,
1、need to do sth 需要做某事 例：You don't need to have the bike repaired right away.你不必马上去修车.
2、need 作情态动词,后面直接接动词原形 need do sth“需要做某事” I need do my homework right now.我要马上做作业了.
3、need doing = need to be done 需要……被做,这两短语没有什么区别 例：The room needs cleaning = The room needs to be cleaned.房间需要打扫了.
be seen+doing
be seen+done
be seen+to do
see sb+do
see sb+doing
see sb+done这些词语都分别是什么意思,怎么用,怎么区别
某人被看到正在做某事
没有be seen done这个用法的
某人被看到他做某件事的全部过程
看见某人做某事的全部过程
看见某人正在做某事
没有see sb done的句型
been seen doing/done跟see sb doing/do主要看主语是谁,还有是主动的还是被动的
扩展阅读：www.sony.com.cn ... serve sb sth提供 ... witness sb do ... see sth done举例 ... see sth doing sth ... see sb seated ... see sb being done ... see sb done的区别 ... see sb done例句 ...
