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一、用作连词
in case 用作连词时有以下两种用法。
1. 表示条件，意为“如果”“万一”。如：
In case it rains， do not expect me. 如果下雨，就不要等我了。
In case you see him， ask him about it. 如果你见着他，问问他这事。
In case I forget， please remind me of my promise. 如果我忘了，请提醒我我的诺言。
In case he arrives before I get back， please ask him to wait. 如果他在我回来之前到，请让他等等我。
2. 表示目的，意为“以防”“生怕”。如：
I’m shy of buying shares in case I lose money. 我不敢买股票，怕赔钱。
Take warm clothes in case the weather is cold. 带些暖和的衣服，以防天气变冷。
I’ll keep a seat for you in case you should change your mind. 我给你留一个座位，以防你会改变主意。
We took our swimming things in case we happened to find a pool. 我们带上游泳用品，以备万一能找到一个水池。
注：有时从句的谓语由 should 构成，强调偶然性，可译为“万一”。如：
I wrote down her address in case I should forget it. 我写下了她的地址，以防万一我忘了。
I always slept by the phone in case he should ring during the night. 我总是睡在电话机旁边，怕万一他夜间打电话来。
二、用作副词
in case 用作副词时，其意为“以防万一”。如：
Better take an umbrella in case. 最好带把伞，以防下雨。
The dog was chained， but I carried a stick in case. 狗是用链条锁住的，但我带着一根棍子以防万一。
注：in case 的副词性用法，可视为其后省略了一个目的状语从句，其意为“以防有什么情况”。如：
The sun is shining， but I’ll take an umbrella just in case （it should rain）. 现在是晴天，但我还是带上雨伞以防万一。
The bus is usually on time， but start early， just in case （you are late）. 公共汽车一般是准时的，但还是早一点走好，以防有什么情况。
三、用于 in case of
in case of 为介词，其用法与用作连词时的用法相似。
1. 表示条件，意为“如果”“万一”。如：
In case of fire， ring the bell. 如发生火灾，就按此铃。
In case of emergency， break the glass and press the button. 遇到紧急情况时，击碎玻璃罩并按下按钮。
In case of my not being here， ask my brother to help you. 如果我不在，可让我弟弟帮助你。
2. 表示目的，意为“以防”。如：
I keep an umbrella here in case of rain. 我在这里放一把雨伞以防下雨。
The wall was built along the river in case of floods. 沿江筑了堤坝，以防涨水。
补充说明：在某些特定的语境中，in case 有时有比较特殊的意思。如：
I was so amazed that I had to pinch myself in case it was all a dream. 我非常惊讶，连忙掐了自己一把，看是否这一切都是一场梦。
【实战训练】
1. He had his camera ready， just____he saw something that would make a good picture.
A. when B. unless C. in case D. as long as
2.____I’m late， start without me.
A. Until B. Unless C. In case D. No matter
3. I keep the bedroom door open____the children call for me in the night.
A. until B. unless C. in case D. because
4.____I’ve got a car， I don’t get as much exercise as I used to.
A. As soon as B. In case C. Now that D. So that
5. Mother asked me to take more money____something unexpected should happen.
A. in case B. so that C. in order that D. when
6. Bring a map____you get lost.
A. when B. unless C. in case D. as long as
7.____we’ve got a few minutes to wait for the train， let’s have a cup of coffee.
A. Until B. Since C. If D. In case
8. I don’t think I’ll need any money but I’ll bring some just.
A. now that B. in case C. as well D. as long
9.____you are unable to answer， perhaps we should ask someone else.
A. Until B. Since C. If D. In case
10. I’ll prepare enough food just____they decide to stay for dinner.
A. in case B. so that C. in order that D. as much as
11. I wouldn’t dare have a party in my flat____the neighbours complained.
A. because B. in case
C. now that D. even if
12. I’ll keep his addressI need it.
A. so that
B. in order that
C. in case
D. when
13. Companies are buying in supplies of paper，____the price goes up.
A. so that
B. in case
C. even though
D. in order that
14. Will you keep my place in the queue for me____I go and make a phone call?
A. since B. while
C. in case D. until
15.____we know each other a little better， we get along fine.
A. As soon as
B. In case
C. Now that
D. So that
【参考答案】
1—5 CCCCA
6—10 CBBBA
11—15 BCBBC
（编辑 周贞雄）
in case 用作连词时有以下两种用法。
1. 表示条件，意为“如果”“万一”。如：
In case it rains， do not expect me. 如果下雨，就不要等我了。
In case you see him， ask him about it. 如果你见着他，问问他这事。
In case I forget， please remind me of my promise. 如果我忘了，请提醒我我的诺言。
In case he arrives before I get back， please ask him to wait. 如果他在我回来之前到，请让他等等我。
2. 表示目的，意为“以防”“生怕”。如：
I’m shy of buying shares in case I lose money. 我不敢买股票，怕赔钱。
Take warm clothes in case the weather is cold. 带些暖和的衣服，以防天气变冷。
I’ll keep a seat for you in case you should change your mind. 我给你留一个座位，以防你会改变主意。
We took our swimming things in case we happened to find a pool. 我们带上游泳用品，以备万一能找到一个水池。
注：有时从句的谓语由 should 构成，强调偶然性，可译为“万一”。如：
I wrote down her address in case I should forget it. 我写下了她的地址，以防万一我忘了。
I always slept by the phone in case he should ring during the night. 我总是睡在电话机旁边，怕万一他夜间打电话来。
二、用作副词
in case 用作副词时，其意为“以防万一”。如：
Better take an umbrella in case. 最好带把伞，以防下雨。
The dog was chained， but I carried a stick in case. 狗是用链条锁住的，但我带着一根棍子以防万一。
注：in case 的副词性用法，可视为其后省略了一个目的状语从句，其意为“以防有什么情况”。如：
The sun is shining， but I’ll take an umbrella just in case （it should rain）. 现在是晴天，但我还是带上雨伞以防万一。
The bus is usually on time， but start early， just in case （you are late）. 公共汽车一般是准时的，但还是早一点走好，以防有什么情况。
三、用于 in case of
in case of 为介词，其用法与用作连词时的用法相似。
1. 表示条件，意为“如果”“万一”。如：
In case of fire， ring the bell. 如发生火灾，就按此铃。
In case of emergency， break the glass and press the button. 遇到紧急情况时，击碎玻璃罩并按下按钮。
In case of my not being here， ask my brother to help you. 如果我不在，可让我弟弟帮助你。
2. 表示目的，意为“以防”。如：
I keep an umbrella here in case of rain. 我在这里放一把雨伞以防下雨。
The wall was built along the river in case of floods. 沿江筑了堤坝，以防涨水。
补充说明：在某些特定的语境中，in case 有时有比较特殊的意思。如：
I was so amazed that I had to pinch myself in case it was all a dream. 我非常惊讶，连忙掐了自己一把，看是否这一切都是一场梦。
【实战训练】
1. He had his camera ready， just____he saw something that would make a good picture.
A. when B. unless C. in case D. as long as
2.____I’m late， start without me.
A. Until B. Unless C. In case D. No matter
3. I keep the bedroom door open____the children call for me in the night.
A. until B. unless C. in case D. because
4.____I’ve got a car， I don’t get as much exercise as I used to.
A. As soon as B. In case C. Now that D. So that
5. Mother asked me to take more money____something unexpected should happen.
A. in case B. so that C. in order that D. when
6. Bring a map____you get lost.
A. when B. unless C. in case D. as long as
7.____we’ve got a few minutes to wait for the train， let’s have a cup of coffee.
A. Until B. Since C. If D. In case
8. I don’t think I’ll need any money but I’ll bring some just.
A. now that B. in case C. as well D. as long
9.____you are unable to answer， perhaps we should ask someone else.
A. Until B. Since C. If D. In case
10. I’ll prepare enough food just____they decide to stay for dinner.
A. in case B. so that C. in order that D. as much as
11. I wouldn’t dare have a party in my flat____the neighbours complained.
A. because B. in case
C. now that D. even if
12. I’ll keep his addressI need it.
A. so that
B. in order that
C. in case
D. when
13. Companies are buying in supplies of paper，____the price goes up.
A. so that
B. in case
C. even though
D. in order that
14. Will you keep my place in the queue for me____I go and make a phone call?
A. since B. while
C. in case D. until
15.____we know each other a little better， we get along fine.
A. As soon as
B. In case
C. Now that
D. So that
【参考答案】
1—5 CCCCA
6—10 CBBBA
11—15 BCBBC
（编辑 周贞雄）