定语从句中，如果关系代词作宾语的话可以省略，比如说：
I
like
the
book
(that/whcih)
you
bought
for
me.
The
man
(who/that/whom)
he
is
talking
with
is
from
the
USA.
介词提前就不能省略了。The
man
with
whom
he
is
talking
is
from
the
USA.
这里就不能省了。
希望能帮到你，不懂追问。
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