从小到大，我们都学习过which 和 that 引导的从句，只是限于考试，从来没有仔细去辨别它们隐含的意思。英语不是我们的母语，当开始用英语写作时，才会发现，如果which 和 that的一些小细节处理不当，有可能产生歧义，这是严谨的英语写作中应当尽量避免的问题。
让我们重新温习一下which 和 that引导的从句，如何定义，如何区别。
Which: used to add extra information to aprevious clause, in writing usually after a comma（用于为前边的从句补充额外信息，书面英语中通常用于逗号之后）
那个，那些，那种情况
That bar on Milton Street, which by the way is very nice, is owned by Trevor's brother.米尔顿大街上的那家酒吧，顺便提一句那里非常棒，是特雷弗的哥哥开的。
She says it's Charlotte's fault, which is stupid, and that she blames her.她说那是夏洛特的错，真是一派胡言，竟然还责怪她。
Anyway, that evening, which I'll tell you more about later, I ended up staying at Rachel's place.总之，那天夜里我住在了雷切尔那里，我以后会告诉你更多那天晚上的事。
That: used as the subject or object of averb to show which person or thing you are referring to, or to addinformation about a person or thing just mentioned. It is used for both people and things. It can often be left out（用作动词的主语或宾语，指代人或事物或对刚提到的人或事物作补充，常常可省略）
I can't find the books (that) I got from the library.我找不到从图书馆借来的那些书了。
Is this the train that goes to Braintree?这是去布雷恩垂的火车吗？
Have you been to the restaurant that's just opened in town?你去过镇上新开张的那家饭店吗？
首先看看which和that引导的句子所隐含的意思：
再举两个例子，看看which和that引导的句子意思的差别：
为了避免麻烦，在写作中，一定要正确使用which和that。
进行两个快速的练习，来加深对which和that正确使用的理解。
最后总结一下：
