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.
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