急 在线等 九年级英语被动语态的问题
1.Are many buildings built by the workers ?
2.What is the boy often told to do by the teacher ?
3.How many desks are bought by them every term?
V+to do
long, want, expect, hope, wish, desire, refuse, agree, pretend, promise, aim, choose, decide, claim, demand, learn, manage, afford, happen, fail, seem, appear, intend, ask, beg, bother, hesitate, offer, threaten, volunteer…
suggest/finish/avoid/stop/can't help(禁不住) /mind (在乎) /need/enjoy/require/put off/delay/excuse/escape/miss 等动词都可以用动名词doing 一、一般现在时：
1.概念：经常、反复发生的动作或行为及现在的某种状况。
2.时间状语： always, usually, often, sometimes, every week (day, year, month…), once a week, on Sundays,
3.基本结构：动词 原形 （如主语为第三人称单数，动词上要改为第三人称单数形式）
4.否定形式：am/is/are+not;此时态的谓语动词若为行为动词，则在其前加don't,如主语为第三人称单数，则用doesn't，同时还原行为动词。
5.一般疑问句：把be动词放于句首；用助动词do提问，如主语为第三人称单数，则用does，同时，还原行为动词。
6.例句：. It seldom snows here.
He is always ready to help others.
Action speaks louder than words.
二、 一般过去时：
1.概念：过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为。
2.时间状语：ago, yesterday, the day before yesterday, last week,last(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc.
3.基本结构：be动词；行为动词 的过去式
4.否定形式：was/were+not;在行为动词前加didn't，同时还原行为动词。
5.一般疑问句：was或were放于句首；用助动词do的过去式did 提问，同时还原行为动词。
6.例句：She often came to help us in those days.
I didn't know you were so busy.
三、 现在进行时：
1.概念：表示现阶段或说话时正在进行的动作及行为。
2.时间状语：now, at this time, these days, etc.
3.基本结构：am/is/are+doing
4.否定形式：am/is/are+not+doing.
5.一般疑问句：把be动词放于句首。
6.例句： How are you feeling today?
He is doing well in his lessons.
四、 过去进行时：
1.概念：表示过去某段时间或某一时刻正在发生或进行的行为或动作。
2.时间状语：at this time yesterday, at that time或以when引导的谓语动词是一般过去时的时间状语等。
3.基本结构：was/were+doing
4.否定形式：was/were + not + doing.
5.一般疑问句：把was或were放于句首。
6.例句：At that time she was working in a PLA unit.
When he came in, I was reading a newspaper.
把her提前当主语就变成 She was seen to dance by them（她被他们看 到）
2）没看懂，打错了吧
3）原句为 * often hear her to sing this pop song(*经常听她唱).把她提前当主语She is often heard to sing this pop song（她经常被*听到唱）.
注意：*指的是某一人，由于不重要，所以用被动，*这个不重要的人就不会出现了。
这就是被动语态的用处。例如1）中by them可以去掉。因为该句子强调她被看到唱，而不是强调他们看到她唱。从被动句中也看看出句子强调的对象。
“被动语态中，这里为什么动词的过去分词后有to？”
从原句中可以看出，是动词的用法。1）中是see的用法see sb to do=sb is seen to du 3)中是hear 的用法。hear sb to do=sb is heard to do
具体的，你学了就会明白的。很有意思的。
祝你学得开心！
使役动词have ,make,let,感官动词see,listen,feel,notice,后面要跟动词原形，即省略to的不定时做宾补，变为被动语态这要带上to 的不定时做主语补足语,即主动语态They saw her dance
被动语态She was seen to dance by them
The boss makes the workers 12 hours a day
The workers are made to work 12 hours a day
被动语态后面的动词都要加to 记住这个就可以了 - -
被动语态的句型
肯定句：主语+be +过去分词+（by～）.
否定句：主语+be not +过去分词+（by～）.
一般疑问句：Be +主语+过去分词+（by～）？
特殊疑问句：疑问词+be +主语+过去分词+（by～）？
被动语态白表示某事被做，例如we cleaned our classroom everyday变成 Our classroom is cleaned everyday，跟to无关，原来是什么句式就用什么句式
特殊情况： 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
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