区别主要可以从以下三点:
1、where引导
定语从句时, where是
关系副词, 在从句中作地点状语,, where引导的从句修饰
先行词。例如:
The bookshop where I bought this book is not far from here.
We will start at the point where we left off.
2、where引导状语从句时, where是
从属连词, where引导的从句修饰主句的
谓语动词, where前面没有表示地点的先行词。如:
Wuhan lies where the Changjiang River and the Han Jiang River meet.
Make a mark where you have any doubts or questions.
有时, where引导的
地点状语从句兼有抽象条件含义, 可放在主句的前面, 而where引导的定语从句则不能。如:
Where there is water, there is life. 有水的地方就有生命。
3、在有些情况下, where引导的定语从句可转换为where引导的地点状语从句。如:
A tall building was put up at the place where there used to be a desert. (=A tall building was put up where there used to be a desert. )在以前曾是沙漠的地方盖起了一幢高楼。