important是什么意思-平实
限制性和非限制性定语从句
1) 定语从句有限制性和非限制性两种
。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。