分析：1－3DBB ①因定语从句过长，为使句子保持平衡，常将定语从句和其所修饰的名词或代词分开。如题1，when引导的定语从句和先行词the hours分开。②在定语从句中使用“插入语”以增加语言的灵活性。如题2中的“of course”为插入语，题3中 的“I thought”为插入语。
“热点”之四：as和which引导的定语从句
典型考题：
1．＿＿＿＿ is known to everyone, the moon travels round the earth once every month．(NMET2001)
A． That B． It C． Which D． As
2．The result of the experiment was very good, ＿＿＿＿ we hadn’t expected．(北京2000春)
A． when B． that C． which D． what
3．＿＿＿＿ is mentioned above the number of the students in senior high schools is increasing． (上海’99)
A． Which B． AsC． That D． It
4．Those houses are sold at such a low price ＿＿＿＿ people expected． (上海2000)
A． like B． as C． that D． which
分析：1－4DCBB ①由as, which 引导的非限定性定语从句中，as和which可代整个主句，相当于and this或and that。as引导的定语从句可放在主句之前、之后或插在句中，而which引导的从句只能放在主句后面。如题1，as引导的从句置于句首。②as引导定语从句有“正如”、“就像”之意，具有描述性的特点，而which没有，如题2和题3。③在固定结构“such/as /so．．．as”， “the same．．． as”,用as而不用which，如题4。再如：
He is as brave a man as ever lived．他是世界上最勇敢的人。
Don\'t read such books as are not worth reading．不要读那些不值得读的书。
I have got into the same trouble as he (has).
The film is so good as we saw last night.(as 作saw 的宾语)
“热点”之五：定语从句及其近似句型
典型考题：
1．It is the ability to do the job ＿＿＿＿ matters not where you come from or what you are． (NMET 2000)
A． one B． that C． what D． it
2．You should make it a rule to leave things ＿＿＿＿ you can find them again．(NMET’99)
A． when B． where C． them D． there
3．She thought I was talking about her daughter, ＿＿＿＿ in fact, I was talking about my daughter． (NMET’95)
A． whom B． where C． while D． which
4．Go and get your coat．It’s ＿＿＿＿ you left it． (MET’92)
A． there B． where C． there whereD． where there
分析：1－4 BBCB在高考题和平时的练习中有一些句子看似定语从句而实际上是其他句型。如题1为强调句，that在此处不是关系代词，而是强调句中的连词。题2为状语从句，where为连接副词而非关系副词。题3为并列句，while表示“而，却”。题4为表语从句，where在此是连接副词。
易与定语从句混淆的其他复合句
1.定语从句与同位语从句
定语从句与前面的名词是修饰与被修饰的关系“……的（名词）”。而同位语从句是用来说明前面名词的内容。与that从句同位的名词必须是一些表事实或概念的抽象名词，如fact, news, belief, truth, reply等。that在定语从句中作成分，可用which 或who/whom代替；而that在同位语从句中不充当任何句子成分，只起连接作用。试比较：
1)We all have heard the news that our team won. (同位语从句，that从句表示news的内容，that 在从句中不作任何成分)
2)We don’t believe the news that/which he told us yesterday.(定语从句，that 作told 的宾语)
2.定语从句与状语从句。试比较：
1)He left the key where he had been an hour before.
(where引导地点状语从句，相当于in the place where)
2)He left the place where he lived for many years.
