怎样把被动语态变成主动语态
把主动语态改为被动语态，可以遵循以下几个步骤：
1. 把宾语变成被动语态中的主语；
2. 找出谓语动词，变成相应的被动。如：一般式变成be done。过去式变成was/were done；
3. 把主语变成介词by 的宾语；
4. 注意人称、时态和数的变化。
例：1. Bruce writes a letter every week. →A letter is written by Bruce every week.
2. Li Lei mended the broken bike this morning.→The broken bike was mended by Li Lei this morning.
3. He has written two novels so far.→Two novels have been written by him so far.
4. They will plant ten trees tomorrow.→Ten trees will be planted by them tomorrow.
5. Lucy is writing a letter now.→A letter is being written by Lucy now.
6. You must lock the door when you leave.→the door must be locked when you leave.
把主动语态改为被动语态非常简单，可以遵循以下几个步骤：
1.
先找出谓语动词；
2.
再找出谓语动词后的宾语；
3.
把宾语用作被动语态中的主语；
4.
注意人称、时态和数的变化。
例：1.
Bruce
writes
a
letter
every
week.
→A
letter
is
written
by
Bruce
every
week.
2.
Li
Lei
mended
the
broken
bike
this
morning.→The
broken
bike
was
mended
by
Li
Lei
this
morning.
3.
He
has
written
two
novels
so
far.→Two
novels
have
been
written
by
him
so
far.
4.
They
will
plant
ten
trees
tomorrow.→Ten
trees
will
be
planted
by
them
tomorrow.
5.
Lucy
is
writing
a
letter
now.→A
letter
is
being
written
by
Lucy
now.
6.
You
must
lock
the
door
when
you
leave.→the
door
must
be
locked
when
you
leave.
一、 被动语态的用法：
1. 一般现在时的被动语态构成：is / am / are + 及物动词的过去分词
Our classroom is cleaned everyday.
I am asked to study hard.
Knives are used for cutting things.
2. 一般过去时的被动语态构成：was / were + 及物动词的过去分词
A new shop was built last year.
Dinosaur eggs were laid long long ago.
3. 现在完成时的被动语态构成：has / have + been + 及物动词的过去分词
This book has been translated into many languages.
Many man-made satellites have been sent up into space by many countries.
4. 一般将来时的被动语态构成：will+ be + 及物动词的过去分词
A new hospital will be built in our city.
Many more trees will be planted next year.
5. 含有情态动词的被动语态构成：情态动词+ be + 及物动词的过去分词
Young trees must be watered often.
Your mistakes should be corrected right now.
The door may be locked inside.
Your homework can be handed in tomorrow.
6. 现在进行时的被动语态构成：am / is / are + being + 及物动词的过去分词
Uncle Wang is mending my bike now.→
My bike is being repaired by Tom now.
They are planting trees over there. →
Trees are being planted over there by them.
7. 不定式的被动语态：to + be + 及物动词的过去分词
There are two books to be read. →
There are twenty more trees to be planted.
二、 怎样把主动语态改成被动语态?
把主动语态改为被动语态非常简单，可以遵循以下几个步骤：
1. 先找出谓语动词；
2. 再找出谓语动词后的宾语；
3. 把宾语用作被动语态中的主语；
4. 注意人称、时态和数的变化。
例：1. Bruce writes a letter every week. →A letter is written by Bruce every week.
2. Li Lei mended the broken bike this morning.→The broken bike was mended by Li Lei this morning.
3. He has written two novels so far.→Two novels have been written by him so far.
4. They will plant ten trees tomorrow.→Ten trees will be planted by them tomorrow.
5. Lucy is writing a letter now.→A letter is being written by Lucy now.
6. You must lock the door when you leave.→the door must be locked when you leave.
三、 使用被动语态应注意的几个问题：
1. 不及物动词无被动语态。
What will happen in 100 years.
The dinosaurs disappeared about 65 million years ago.
2. 有些动词用主动形式表示被动意义。
This pen writes well.
This new book sells well.
3. 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 wallet was seen to drop by a girl when she passed by.
The boss made the little boy do heavy work.→The little boy was made to do heavy work by the boss.
4. 如果是接双宾语的动词改为被动语态时，直接宾语(物)作主语，那么动词后要用介词，这个介词是由与其搭配的动词决定。
He gave me a book.→A book was given to me by him.
He showed me a ticket.→A ticket was shown to me by him.
My father bought me a new bike. →A new bike was bought for me by my father.
5. 一些动词短语用于被动语态时，动词短语应当看作一个整体，而不能丢掉其中的介词或副词。
We can’t laugh him. →He can’t be laugh by us.
He listens to the radio every day. →The radio is listened to by him every day.
The nurse is taking care of the sick man. →The sick man is being taken care of by the nurse.
主动语态变被动语态时,主动语态句中的宾语变成被动语态句中的主语,主动语态句中的主语成为被动语态句中的动作的发出者.
被动语态的口诀
一般现、过用be done,be有人称、时、数变.
完成时态have(has) done,被动将been加中间.
一般将来shall (will) do,被动变do为be done.
将来进行无被动,shall (will) be doing,
现在完成进行同,have (has) been doing.
现、过进行be doing,被动be加being done.
情、助、有、是妥安排,一律随新主语变.
否定助后加not,疑问一助置主前.
主语恰是疑问词,直陈语序主在前.
一般情助加be done,双宾多将间宾变.
复合宾语宾变主,宾补、主补相应变.
第二句"be有人称、时、数变"即be有人称、时态和单、复数的变化."情助"是指情态动词和助动词must,may,can,shall,will等一律随新主语(多是主动句中的宾语)来变化."疑问一助置主前"是说有两个助动词的话,应把主语放在第一助动词之后或把第一助动词置于主语之前.
被动语态的主语是主动语态的宾语，宾语是主动语态的主语，所以转换时，主宾互换再把被动态BE去掉
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