先行詞在定語從句做主語,定語從句謂語單複數由先行詞決定。這裏,根據先行詞類別,分別舉例如下:
1、 先行詞為人→關係代詞用who, 不能省略
The boys that are playing football are from America.
People who create computer viruses are called hackers.
The lady who stands behind the counter has bought a book.
The man who I served was wearing a hat.
2、先行詞為物→關係代詞用that或which,不能省略。
The books which are on the counter are theirs.
The cars which are produced in Hubei province sell very well.
A dictionary is a book which gives the meaning of words.
特別提醒:非限制性定語從句, 關係代詞不能用that,只能用which。