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BE sAw to Do

be+done(过去分词) 构成被动语态see,saw,seen分别是动词原形,过去式和过去分词. 这是被动语态问题.

举个例子来说吧i saw him play football on the playground just now.变成被动语态应该是he was seen to play football on the playground just now.i saw him playing football when i passed the playground. 变成被动语态应该是he was seen playing football when i passed the playground.see 是感官动词,在变成被动语态时to 不能省略,这个to是动词不定式的标志,跟接动名词形式不是一回事,动名词 不是不定式,为什么非要接to呢

be seen to do sth.表示表示动作经常发生或被观看全过程. (对比:be seen doing sth.强调被看到时动作正在进行.) 比如:I saw him get on the bus.-->He was seen to get on the bus.(他上车的整个过程我都看到了.) He was seen to steal

be +动词不定式(即be + to do sth.)的用法如下: 1.表示按计划或安排要做的事.例如: when are you to leave for home?你什么时候回家? she is to be married next month.她将于下个月结婚. the queen is to visit japan in a week's time.女王

没有be seen do sth.原型是see do变为被动语态要加to,即be seen to do sth.be seen to do sth.表示主语做的动作整个过程(一般比较短)都被看到.be seen doing sth.强调被看到时动作正在进行.比如:I saw him get on the bus.-->He was

saw为see的过去式及过去分词,故用法与之相同.即:see/saw sb do sth 看见某人做过某事 see/saw sb doing sth 看见某人正在做某事,强调“进行”这一过程

主动语态中,hear只能接不带to的不定式或动名词作宾语,即:hear sb do ;hear sb doing 在被动语态中,要将不定式前加上to,即:be heard to do;be heard doing 你所提是在被动语态中,所以be heard to doing不存在.be heard to do 被听说将

有.例如It is strange to see such wonderful scenery in that area.

see sb. doing 看见某人正在做某事see sb. do 看见某人做某事(整个过程)

这属于省略to的动词不定式作宾补时变为被动语态要加上to 这类词还有 一感 fell 二听 listen to hear 三让 let make have 四看 look at see watch notic 半帮助 help sb do sth

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