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动
词
不
定
式
作
用法
状语
动词不定式直接做目的状语
in
order to do sth.
作目的
表示目的
状语，可以位于句首，句中
例句
We work
hard
to
be
admitted
into
a key university.
In order
to finish his work on
time,he
worked
like
crazy=He
worked
like
crazy
in
order
to
finish
his work on time.
so
as
to
do
sth.
作目的状语，
He
worked like
crazy
so as
to
不可位于句首
finish his work on time.
表示结果
only to do
sth.
常表示出乎
We
hurried
to
the
classroom
only
意料的结果
to find
none there.
…enough
to
do…;too…
to
The
girl was so kind as to help
do;so…as
to
do;such…as
to
the old man off the bus.
do
结构中，to do…表示结果
I’m
not
such
a
fool
as
to
believe that.
He’s old enough to make a trip
alone.
It’s too cold for you
to word
outside.
动词不定式可以直接表示原
He
was
astonished
to
hear
the
因
terrible news.
表示原因
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