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灯火商贸网 2024-06-11 450 10

before表示时间先后顺序地点或位置条件或前提

before表示时间先后顺序地点或位置条件或前提
一、时间先后顺序
“before”最常见的用法是表示时间上的先后顺序,即某事发生在另一事之前。它常常与过去时态连用,用来描述过去发生的两个事件之间的时间关系。例如:
* I had finished my homework before my parents came back. (在父母回来之前,我已经完成了作业。)

二、顺序或排列
除了表示时间上的先后顺序外,“before”还可以用来表示事物在空间或顺序上的排列。它通常用于描述事物的前后位置或顺序。例如:
* Please write your name before your address. (请在你的地址前写上你的名字。)

三、地点或位置
在某些上下文中,“before”可以用来描述物体相对于另一物体的位置关系。这种情况下,“before”接近于“in front of”的意思。例如:
* The cat sat before the fireplace. (猫坐在壁炉前。)

四、条件或前提
“before”也可以用于表示某个动作或事件发生的条件或前提。它通常与情态动词连用,表达某种必要条件。例如:
* You must finish your report before you can go home. (你必须完成报告才能回家。)
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五、与动词连用
在语法结构中,“before”经常与动词连用,构成时间状语从句。它引导的句子描述主句动作发生之前的情况。例如:
* We need to book the tickets before we can travel. (我们需要先订好票才能旅行。)

六、否定句中的用法
在否定句中,“before”的用法稍有不同。它通常表示“直到……才”的意思,强调某事的延迟发生。例如:
* I didn't realize my mistake until it was too late before I could correct it. (直到我无法纠正时,我才意识到我的错误。)

七、与其他副词连用
“before”有时可以与其他副词连用,共同描述事件的先后顺序或条件。这种连用可以增强句子的表达力。例如:
* They had scarcely arrived before they started arguing. (他们刚到就开始争论了。)

八、特定表达与习语
在英语中,还有一些包含“before”的特定表达或习语,它们具有固定的含义和用法。例如:
* Long before:很久以前
* Before long:不久之后
这些习语在日常交流中经常出现,掌握它们有助于更自然、准确地使用英语。

一、单项选择题
1. I had finished my homework _______ my parents came back.
A. after    B. before    C. when    D. while
2. Please write your name _______ your address.
A. after    B. before    C. during    D. since
3. The cat sat _______ the fireplace.
A. behind    B. before    C. beside    D. between
4. You must finish your report _______ you can go home.
A. after    B. before    C. when    D. until
5. We didn't start the meeting _______ everyone had arrived.
A. until    B. after    C. before    D. since

二、填空题
1. She left the office _______ it started to rain.
2. I had never seen such a beautiful sunset _______ I went to Hawaii.
3. The train left the station _______ the passengers had boarded.
4. We need to make a decision _______ it's too late.
5. I had barely finished my meal _______ the phone rang.

三、改错题
1. I will do my homework after I finish watching TV. (改为使用“before”)
2. She went to bed after she brushed her teeth. (改为使用“before”)
3. We started eating dinner before the food was ready. (找出错误并改正)
4. I had to wait for my friend before we could go to the movies. (改为否定句)
5. I had never been to Japan before I visited last year. (改为肯定句)

四、翻译题
1. 请在吃饭前洗手。(Translate this sentence using “before”.)
2. 我还没有说完话,他就已经挂断了电话。(Use “before” to express this idea.)
3. 我们必须在太阳下山前到达山顶。(Translate this sentence using “before”.)

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