掌握好引导词很重要.
1.先行词是人和物 that /who/whose 2.先性词是物用that ,which,前两者可作主,宾语,定语3.先行词是物,但再从句中作状语分别用when,where,why,所以关键是看先行词是人是物,且在从句中作何种成分.如：
1.This is the person (who /that,x) you want to look for.
2.The things (that)you are worrying about is really difficult.
3.The school (where) you had studied
(that /which/x) he is talking about
(that/which )lies beside the lake is very beautiful.
(in which )they are working
4.The day (when/on which) he lived a bad life
(that/which/x) he spent in the country is gone
(which/ that/x)they are looking forward to
x表是可省略,认真看懂这些句子,你就快懂了.