1.用作状语 介词短语表示时间、地点、方式和原因等。如: Class
begins
at
half
past
seven.
(时间)
7时半开始上课。 His
parents
work
on
a
farm.
(地点)
他父母在农场工作。 She
came
here
by
train.
(方式)
她乘火车来这里。 You
don’t
have
to
worry
about
that.
(原因)
你不必为那件事担心。2.
用作定语 作定语用的介词短语应放在所修饰的名词之后。如: The
book
on
the
desk
is
very
interesting.
书桌上的那本书很有趣。 The
young
man
from
Guilin
is
my
uncle.
从桂林来的那位年轻人是我叔叔。 We
visited
the
museum
in
the
centre
of
the
city.
我们参观了市中心的博物馆。3.
用作表语 在系动词后的介词短语用作表语。如: My
father
was
in
the
army
two
years
ago.
两年前我父亲在部队。 This
book
will
be
of
great
use
to
you.
这本书对你会有很大的用处。