He has a son,who is an engineer.
He has a son who is an engineer.
这两个句子的词素完全相同,又都是主从复合句,但涵义并不一样。
第一句的son之后有逗号,其后为非限制性定语从句。全句的意思是:他只有一个儿子,职业是工程师,说话的重点是只有一个儿子,儿子的职业是工程师只是附带的说明而已。
第二句的son之后没有逗号,其后是限制性定语从句。全句的意思是:他有一个当工程师的儿子,可能这个儿子是独子,也可能不是独生子,说话的重点放在儿子的职业上。
通过上列句子的比较,我们可以举一反三地去辨别下面两组句子的差异:
Lees sister,who lives in Macau,is a nurse.
Lees sister,who lives in Macau is a nurse.
My nephew,who is a teacher,has gone to England.
My nephew,who is a teacher,has gone to England.
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