1、使役动词 make （let, have ）sb do sth
2、感官动词 see （hear ,watch ,listen to , notice ）sb do sth
例如：
1) .We often see him play football .
He is often seen to play football by us .
2). The boss made his workers work 12 hours a day .
The workers were made to work 12 hours a day by the boss .
3) I heard her sing in the room yesterday .
She was heard to sing in the room by me yesterday .本回答被网友采纳
什么样的动词变为被动语态要后置to不定式?
凡是省略了to的不定式作宾语补足语，变被动语态时to都要还原。常见的有：\\x0d\\x0a1、使役动词 make （let, have ）sb do sth \\x0d\\x0a2、感官动词 see （hear ,watch ,listen to , notice ）sb do sth \\x0d\\x0a例如：\\x0d\\x0a1) .We often see him play football .\\x0d\\x0...
什么样的动词变为被动语态要后置to不定式?
有些动词主动形式后接不带to 的动词不定式，但是被动时则需要恢复to,比如常用的词make sb do sth ,被动be made to do sth。关于不带to的不定式，举个例子：They did not observe she come in and go upstairs。被动：She wasn't observed (by them) to come in and go upstairs。带doing的就...
变被动,必加to的语法情境
一、使役动词+宾语 在let, make, have等使役动词接宾语的结构中，通常用不带to的不定式。但当使役动词为被动态时，不带to不定式转为带to不定式。主动：Let’s go and play basketball. 让我们去打篮球吧！The teacher made him stay there quietly. 老师让他安静地呆在那里。Her father had her d...
改为被动语态什么时候用by、for和to?
一、用to 感官动词或使役动词使用省略to的动词不定式,主动语态中不带to ,但变为被动语态时,须加上to .例：make somebody do something→somebody+ be +made to do something see somebody do something→somebody +be +seen to do something A girl saw my wallet drop when she passed by.→My ...
英语主动语态变被动什么时候用动词不定式to
主动语态中含有感观动词（feel,hear,see,listen to,watch,look at)和使役动词(make,let,have)时，变被动语态时，要把不定式符号加回来。如：He makes me do my homework.---I am made to do my homework by him.I saw her fall off her bike---She was seen to fall off her bike....
在被动语态中什么时候动词后要加to,尽量说得简单一些!!!
一般是不及物动词要用的。主要是看这个动词本身在不是被动的时候是怎么用的，如果要跟介词才能用的，不管是to还是in啊神马其他的，那么转成被动的时候后面都要拖着那个介词的啦~~特别是词组神马的要注意！
由主动变被动要加to的是感官动词还是使役动词
在主动语态变被动语态时,书上说感官动词和使役动词变被动语态后要加to 这句话的意思是,原来的句子为省to不定式时在被动句时要把to还原 也就是make\/see\/watch sb do这种形式的时候在被动语态时被要把to还原 第一句中more beautiful是形容词作宾补 第二句是see sb doing的形式 所以不要加to ...
请问:make一词。用在被动语态中时。要将to 还原。那如果用在完成时态...
(1)在主动语态中,make , let , hear , see , watch , notice 等词,其后跟省略to的动词不定式(动词原形),在变为被动语态时,必须还原动词不定式符号to.如:We heard him sing this song in the room.He was heard to sing this song in the room.The boss made him work 14 hours a day....
为什么有些被动语态要+to 这种类型有哪些
如果宾语补足语是不带to 的不定式，变成被动语态的时侯，这个不定式前面就要要加"to"。这种类型的动词大多是感官动词：feel, hear, help, listen to, look at, make, observe, see, notice, watch
see的被动语态后面为什么加to
在英语语法中，在主动语态中，感官动词和使役动词后面动词不定式作宾语补足语，不定式带to。但改成被动语态后，to要给加上。比如:I saw Tom play on the playground.改成被动语态后，应是:Tom was seen to play on the playground .
