Unit 4 语法篇
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学生通过本讲学习 ,能够掌握本单元的重点词汇句型 ,并在综合能力上有一定的拓展。
用法 | 例句 |
① 主句为一般将来时态 ,if从句用一般 现在时态〔即主将从现〕。诗经两首 | We will stay at home if it rains tomorrow. 如果明天下雨 ,我将要呆在家。 | 马鞍山景点
② 主句中含有情态动词 ,if从句用一般现在时态。 | If you finish your homework, you can go home now.如果你做完了作业 ,你现在可以回家了。 |
③ 主句为祈使句 ,if从句用一般现在时态。 | Don’t jump into the river if you feel very hot. 如果你感到很热 ,不要跳入河里。 |
④ 主句为过去将来时 ,if从句用一般过去时态〔如果涉及到be动词 ,一律都用were商品经济是〕。此时 ,表达的是和现实相反的推测 ,用虚拟语气。 | If I were you, I wouldn’t do it like that. 如果我是你 ,我就不会那么做的。 If you gave me some money, I would be very happy. 如果你给我一些钱 ,我就会很快乐的。 |
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Unless: conj. 除非, 如果不
unless是附属连词 ,引导条件状语从句 ,含有否认意义 ,相当于if条件状语从句的否认形式。unless = if not。
注意：unless引导的条件状语从句和if条件状语从句 ,与其它时间状语从句一样 ,用一般现在时代替将来时。
1. Unless you take more care, you’ll have an accident. 如果不多加小心的话 ,你会出事故的。)
2. My baby sister never cries unless she is hungry. 我那刚出生的妹妹除非饿了 ,否那么她是从来不哭的。
3. Unless bad weather stops me, I jog every day. 除非坏天气阻拦我 ,否那么每天我都慢跑的。
1. A tourist will easily lo his way in Beijing _______he has a map or a guide.
A．丘挺if B．becau C．unless D．when
2. Studying in groups is necessary ________you want to do well in school.
A．if B．until C．unless 辅食添加顺序时间表 D．though
3. --- I hear the famous singer Xu Song may come to Ningbo next month.
--- Really?___________ he comes, my younger sister will be very excited.
A．If B．Until C．Unless D．Before
4. Plea go shopping with me __________you have time.
A．and B．but C．or D．繁华造句if
5. Mum says ___________I do my homework now, I can watch TV for an hour tonight.
A．if B．though C．becau D．while
解析：
1. 句意为"如果一名游客没有地图或者向导,他在北京会很容易迷路。"结合句意可知,所缺的连词是unless,意为"除非",故答案为C
2. if"如果";until"直到……为止";unless"除非";though"尽管"。由句意"在学校里,如果你想取得良好的表现,小组学习是必要的。"可知选A.。
3. if"如果",引导条件状语从句;until"直到……为止",引导时间状语从句;unless"除非",引导条件状语从句;before"在……之前",引导时间状语从句。由答语句意"真的吗?如果他来,我妹妹会非常冲动"知选A.。
4. 依据题意 ,如果有时间的话 ,应选D。。
5. 此题考查条件状语从句 。本句为if 引导的条件状语从句,句意为"妈妈说如果我现在做作业,我就可以在今天晚上看一个小时的电视" 应选A。
根底演练
一 根据句意用适当的连词填空：
A: but although so unless if
1. People couldn’t cross wide rivers __________-they had some sort of boat..
2. They are generous, _________ they are very poor..
3. ____________ you get angry easily, it’s good for you to take deep breaths..
4. It’s ok to be in a bad mood once in a while, _______ if you are always like that, it’s not healthy..
5. It’s cold outside, ___________ put on warm clothes and put on gloves..
B: 单项选择
6. Nobody believes a 92-year-old could run a marathon ________she pasd the finishing line. People of all ages can challenge themlves.
A．if B．since C．until D so
虾滑7 Don't come in ______I call you. We are talking about something important.
A．if B．becau C．unless D．when
8. _________he is very old, he is in healthy.
A．Although; but B．Although; 不填 C．Though; but D．But; 不填
9 --- When are you going to tell Henry the good news?
--- __________he comes back.
A．As much as B．As soon as C．Becau D．But
10..__________ it was very cold, he went out without a coat.
A．Although; but B．But; although C．Although; / D．/; so
二、用单词正确形式填空
1. If your things were stolen, you had better ______(call )“110〞 for help.
2. If you _______(not be) careful enough in the exam, you will not get a good grade.
3. I _______(finish) all my work before I _______(leave).
4. We have to stay at home if it ______(rain) tomorrow.
5. He'll go home as soon as he ________(finish) his homework.
6. I'll give you a call as soon as he_____ (leave) for Washington.
7. They'll go to watch the dolphin show if they _____(have) free time.
8. You mustn't enter the room unless you ______(allow) to.喜欢做某事
9. If she ______(not get) home on time, her mom _____(be) worried.
10. If it______ (rain) tomorrow, we won't go swimming
稳固提高
1除非明天雨停, 否那么我是不会去的。
I won't go tomorrow, _________the rain _______.
2.只要天气好 ,早晨我就锻炼。
I exerci in the morning ______________the weather is fine.
3.如果你去一个太空博物馆 ,你会学到很多知识。
If you _________ to a space muum, you ____________a lot.
4.如果明天下雨 ,我就不去公园了。
If it' s rainy tomorrow, _____________________________.
5.长大后我想成为一名英语教师。
