如何区分非限定性定语从句和限定性定语从句?

Question

如题所述

Answer 1

限制性定语从句是先行词不可缺少的部分，去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明，去掉了也不会影响主句的意思，它与主句之间通常用逗号分开，例如：
This
is
the
house
which
we
bought
last
month.这是我们上个月买的那幢房子。（限制性）
The
house,
which
we
bought
last
month,
is
very
nice.这幢房子很漂亮，是我们上个月买的。（非限制性）
2)当先行词是专有名词或具有唯一性的名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的，例如：
Charles
Smith,
who
was
my
former
teacher,
retired
last
year.
查理史密斯去年退休了，他曾经是我的老师。
My
house,
which
I
bought
last
year,
has
got
a
lovely
garden.
我去年买的的那幢房子带着个漂亮的花园。
This
novel,
which
I
have
read
three
times,
is
very
touching.
这本小说很动人，我已经读了三遍。
3)
非限制性定语从句还能将整个主句作为先行词,
对其进行修饰,
这时从句谓语动词要用第三人称单数，例如：
He
seems
not
to
have
grasped
what
I
meant,
which
greatly
upsets
me.
他似乎没抓住我的意思，这使我心烦。
Liquid
water
changes
to
vapor,
which
is
called
evaporation.
液态水变为蒸汽，这就叫做蒸发。
说明：关系代词that和关系副词why不能引导非限制性定语从句。