2.定語從句與同位語從句的區(qū)別
同位語從句大多由連接詞that引導，常跟在下列名詞后面，如fact，idea，opinion，news，hope，belief等。同位語從句用來解釋說明這些名詞的具體含義和內容。定語從句對所修飾的名詞加以修飾限定，即說明其為此人(事物)而非彼人(事物)。如：
We are familiar with the idea that all matter consists of atoms.(同位語從句)
The news that we are invited to the party is very encouraging.(同位語從句)
This is the best article that has been written on the subject. (定語從句)
4.定語從句與what引導的名詞性從句的區(qū)別
what只能引導名詞性從句，在從句中充當主語、賓語或表語，但總是包含著定語從句的含義，很容易與定語從句混淆。定語從句的引導詞前面都會有先行詞，而what前面則沒有任何先行詞，此時what=先行詞+that。試比較：醫(yī)學.全在線m.payment-defi.com
He always means what he says.
That's the only thing that he says.
That's what I want to say.
That's all (that) I want to say.
This is what I can give you.
This is all the money that I can give you.
(二)比較狀語從句
1.比較狀語從句的種類
(1)同級比較。
英語中表示同級比較的詞有as+形容詞或副詞原形+as；the same as，not so+形容詞或副詞原形+as(不如…)等。
例1：Do you enjoy listening to records? I find records are often _____, or better than an actual performance. (1996.1)
�。跘］ as good as［B］ as good［C］ good［D］ good as
答案為［A］。這里的as good as和better than 由or連接，構成并列關系。
例2：The elimination of inflation would ensure that the amount of money used in repaying a loan would have _____ as the amount of money borrowed.
［A］ as the same value［B］ the same value［C］ value as the same［D］ the value is the same
答案為［B］。the same...as為固定用法。
(2)差級比較。
英語中的差級比較，僅限于兩者之間，常由形容詞或副詞的比較級形式+than 構成。此外還需要注意以下幾點：
�、傧啾容^的內容在語法形式或結構上要保持一致。
英語中，為了避免重復通常用that，one，those來代替前文出現的同類事物，其中that可以代替可數名詞和不可數名詞，而one只能代替單數可數名詞，those只能代替復數可數名詞。如：
No bread eaten by man is so sweet as _____ earned by his own labour. (1994.8)
�。跘］ one［B］ that［C］ such［D］ what
答案為［B］。that代替的是不可數名詞bread。
�、诒硎颈稊档谋容^形式常為：修飾語 + as...as.../more...than...。有時第二個as，than后面的比較內容會省略。例如：
Smoking is so harmful to personal health that it kills _____ people each year than automobile accidents. (1999.2)
�。跘］ seven more times［B］ seven times more［C］ over seven times［D］ seven times
答案為［B］。倍數+ more ...than...為固定結構。
