Ⅱ.重点句型详解

1．...only then did we decide to answer violence with violence.……只有到那时我们才决定用暴力反抗暴力。

only 修饰的时间、条件和方式状语，为了强调而提到句首时，句子要用部分倒装形式，把原句中的情态动词、系动词或助动词提到主语前面。only 如修饰从句而提到句首，主句要部分倒装。

①Only at that time did he realize that he had made a mistake.直到那时他才意识到自己犯的错误。

②Only by practising a few hours every day will you be able to master English.只有通过每天练习几个小时你才能掌握英语。

③Only with all your time and energy can you do the job well.只有用上你全部的时间和精力你才能把这项工作做好。

④Only when I came back was I informed of the news.直到我回来，我才被通知这个消息。

⑤Only if I get a job will I have enough money to go to college.我只有找到了工作才有足够的钱上大学。

提示：(1)在部分倒装句中，如果谓语部分无助动词，则须找助动词来“帮助”它构成倒装句。如：

×Only after the war learned he the sad news.

√Only after the war did he learn the sad news.

(2)only 修饰状语从句时，从句不可倒装。如：

×Only when did he return did we find out the truth.

√Only when he returned did we find out the truth.

(3)only修饰主语时，句子不可倒装。如：

×Only can he answer the question.

√Only he can answer the question.

[即境活用1](2008•江苏)______ you eat the correct food ______ be able to keep fit and stay healthy.

A．Only if; will you　B．Only if; you will   C．Unless; will you D．Unless; you will

解析：“only＋if从句”放于句首，主句用部分倒装。

答案：A

2．I felt bad the first time I talked to a group. 第一次给旅行团作讲解时，我的感觉很不好。

the first time 相当于连词，引导一个状语从句，意为“第一次”。这类特殊短语还有：

(1)each time, every time, next time, last time, any time 等也可以做连词用，表示“无论何时”“每当”“每次”等，引导一个时间状语从句。

Every time we come to Beijing, we go to visit the Forbidden City. 每次我们去北京，我们都去参观故宫。

I didn' t have any penny last time I saw you.上次我看见你时，我身无分文。

(2)immediately, directly, instantly 可活用为连词，引导时间状语从句，表示“一……就……”，相当于 as soon as。

The young man rushed out of the hall immediately he heard the sound.那个年轻人一听到声响就冲出了大厅。

(3)the moment, the minute, the second, the instant 等名词短语也可用做连词，也相当于 as soon as，表示“一……就……”。

The moment Professor Wang appeared on the platform, the audience all stood up and clapped warmly.王教授一出现在讲台上，听众就站起来热烈鼓掌。

(4)the morning/afternoon/evening, the night, the day, the week, the year, the spring/summer/autumn/winter 等一些表示时间段的名词短语也可以引导时间状语从句。

The morning Mr Smith was walking along the lake, he met an old friend.那天早晨史密斯先生在湖边散步时遇到了一位老朋友。

[即境活用2]　______I toured Zhangjiajie, I was deeply impressed with its beautiful scenery.

A．For the first time B．At first  C．It was the first time D．The first time

解析：the first time 用做连词，引导时间状语从句。

答案：D