被动语态由“助动词be+及物动词的过去分词”构成。被动语态的时态变化只改变be的形式wallet是什么意思，过去分词部分不变。疑问式和否定式的变化也如此。
一般用法
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
by
my
mother.
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
The
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.
特殊用法
1.不及物动词无被动语态。
如：happen,
break
down,
come
out......
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。
如：
write,
sell,
ride.....
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
at
him.
→He
can’t
be
laughed
at
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.
构成
be+done.
