小小標點符號，在解題中往往起著不可忽視的作用，例如：逗號是區(qū)分限制性和非限制性定語從句的重要標志。所以，我們在解題時，尤其要注意。請看下列各組句子， 只因小小一“點”之差，卻導致迥然不同的結(jié)果。

1. ⑴The patient _____ this woman nurse takes care of looks better.

⑵The patient， _____ this woman nurse takes care of， looks better.

A. thatB. whom

C. /D. which

分析句(1)結(jié)構(gòu)， this woman nurse takes care of作定語從句， 橫線處應為指人的關(guān)系代詞， 且作takes care of 的賓語，故可用that， whom或者省略。句⑵由逗號將中間部分隔離開來，成為非限制性定語從句，只可選B。

2. ⑴ ______， the 2008 Olympic Games will be held in Beijing.

⑵_______ the 2008 Olympic Games will be held in Beijing.

A. As is known to allB. We all know that

C. It’s known to allD. It’s known that

句⑴中的逗號說明此句只能選A，由as引導非限制性定語從句，as代替整個主句內(nèi)容。句⑵中無逗號隔離，就可以選B使橫線后面的部分作賓語從句；可以選D，由It作形式主語，而that the 2008 Olympic Games will be held in Beijing.則是句子的真正主語。

3.⑴ They’re sister and brother， _____ climbed on Mount Qomolangma and served as an Olympic torch bearer and a photographer on May 8.

⑵ They’re sister and brother; _____ climbed on Mount Qomolangma and served as an Olympic torch bearer and a photographer on May 8.

⑶ They’re sister and brother. _____ climbed on Mount Qomolangma and served as an Olympic torch bearer and a photographer on May 8.

A. both of themB. both of whom

C. Both of themD. both of which

句⑴中逗號后面的部分是非限制性定語從句，故選B。其結(jié)構(gòu)是：both(all/ few/ most/ several/ some等) + of + whom/ which。句⑵中的分號表明前后為兩個并列分句，用them 代替前一句中的sister and brother，選A。 句⑶中的句號表明前后是兩個獨立的句子，故選C。

4. ⑴We ____ Wang Fang our monitor.

⑵We ____ Wang Fang， our monitor.

A. metB. madeC. lookedD. chose

句⑴中的our monitor為名詞，作賓語補足語，可以作此句謂語的是B. made 和D. chose。句⑵中的逗號表明our monitor是 Wang Fang的同位語，故只能選A. met。

5. ⑴ The class meeting _____ over， we left the classroom one by one.

⑵ The class meeting _____ over. We left the classroom one by one.

A. beingB. wasC. isD. would be

句⑴中的逗號表明前半部分不是獨立的句子，且沒有連詞連接兩部分，故用being構(gòu)成的獨立主格結(jié)構(gòu)來作狀語表時間，選A。句⑵中的句號表明它們是各自獨立的句子，故橫線處應選作謂語的was。

編輯/梁宇清