Ⅱ.重點(diǎn)句型詳解

1．There are various reasons why people write poetry.

人們寫詩有各種各樣的理由。

reason why...。reason 的意思是“原因，理由”，后面的定語從句常用 why和 that, which 引導(dǎo)，后接同位語從句時(shí)要用 that引導(dǎo)，對 reason 的內(nèi)容進(jìn)行說明或解釋，要注意它們所使用的場合。

①The reason why he failed the English exam was that he didn't learn it well.

他英語考試不及格的原因是他沒學(xué)好。(why在定語從句中做狀語)

②I don't believe the reason that/ which you gave me.

我不相信你給我的理由。(that和 which在定語從句中做 gave的賓語)

③We are not going for the simple reason that we can't afford it.

我們不去，原因很簡單：我們負(fù)擔(dān)不起。(that 引導(dǎo)同位語從句)

拓展：(1)That is why... 那就是……的原因。(強(qiáng)調(diào)結(jié)果)

(2)This is because... 這是因?yàn)椤?強(qiáng)調(diào)原因)

(3)在 the reason why...is/was that 結(jié)構(gòu)中，一般用 that 引導(dǎo)表語從句，而不用 because.

[即境活用1](2008?四川模擬)The reason for his success is ______ he worked very hard.

A．why ? ? ? B．that ? ? ? ?C．because ? ? ? ?D．for

解析：考查 the reason 的表語從句，由 that 引導(dǎo)。

答案：B

2．Some rhyme(like B) while others do not(like C)．

有些詩押韻(像B)，但也有些不是這樣(像C)。

while的用法歸納：

(1)while 用做并列連詞，構(gòu)成并列句，意為“然而，但是”，相當(dāng)于 and/but, 強(qiáng)調(diào)前后兩種情況的對比或轉(zhuǎn)折，此時(shí)while 一般位于句中。

(2)while 用做從屬連詞，引導(dǎo)時(shí)間狀語從句，意為“當(dāng)……的時(shí)候；和……同時(shí)”，此時(shí)的主從句謂語動作同時(shí)發(fā)生，從句謂語通常是延續(xù)性動詞。

(3)while 引導(dǎo)讓步狀語從句，常放在句首，意為“盡管”“雖然”，比 although或 though 語氣要輕。

(4)while 引導(dǎo)條件狀語從句，意為“只要”，其意思和用法相當(dāng)于 as long 可位于句首，也可位于句中。

(5)while 引導(dǎo)從句時(shí)，如果主從句的主語一致，且從句謂語又含有 be,則從句主語和 be可以省略。while 后可直接跟現(xiàn)在分詞、名詞、形容詞或介詞短語。

①You like sports, while I prefer music.

你喜歡體育，而我更喜歡音樂。

②I was reading the book while you were talking to me.

你對我說話的時(shí)候，我正在看書。

③While it is very cold today, we decide to go out for a walk.

盡管今天天氣很冷，我們還是決定出去走走。

④While a spark of life remains, it is a doctor‘s duty to save the patient.

只要病人還有一線生機(jī)，醫(yī)生就有責(zé)任搶救。

⑤You have to be very careful while (you are) driving.

你開車時(shí)必須很小心。

提示：while 引導(dǎo)時(shí)間狀語從句時(shí)，指一段時(shí)間，不用來表示時(shí)間點(diǎn)；when引導(dǎo)時(shí)間狀語從句時(shí)，既指時(shí)間段，也指時(shí)間點(diǎn)。如：

①When/While I was in middle school, I liked English very much.我上中學(xué)時(shí)非常喜歡英語。

②When he entered, I was watching TV. (不能用 while)當(dāng)他進(jìn)來時(shí)我正在看電視。

[即境活用2](1)(2008年四川非延考區(qū))In some places women are expected to earn money ______ men work at home and raise their children.

A．but　 　B．while ? ? ??C．because ? ? ? ? D．though

解析：while 在此句中意為“然而”，表對比。

答案：B

(2)(2008?湖南卷)______the Internet is of great help, I don't think it's a good idea to spend too much time on it.

A．If ? ? ? ? B．While ? ? ? ?C．Because ? ? ? ? D．As

答案：B

解析：while 引導(dǎo)讓步狀語從句，意為“雖然”。

(3)(2008?上海卷)—Are you ready for Spain?

—Yes, I want the girls to experience that ______ they are young.

A．while ? ? ? ?B．until ? ? ? ?C．if ? ? ? ? ?D．before

解析：while 引導(dǎo)時(shí)間狀語從句，意為“當(dāng)……時(shí)候”。

答案：A