If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。
If you have finished the homework， you can go home．如果你作业做完了就可以回家了。
另外，if从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设。从句多用一般过去时或过去完成时，表示对现在或过去的一种假设。如 If I were you，I would invite him to the party．如果我是你，我会邀请他参加聚会。
I would have arrived much earlier if I had not been caught in the traffic．要不是交通堵塞，我本会来得早一些。
另外你还要注意if 条件句的时态搭配 1． if从句用一般现在时，主句用一般将来时 If he runs he’ll get there in time. 如果他用跑的，他就会及时赶到那儿。
The cat will scratch you if you pull her tail. 如果你拉猫的尾巴，它就会抓你。
2． ．if从句用一般现在时，主句用may/might/can If the fog gets thicker the plane may/might be diverted. 如果雾在大一些，飞机可能就会改在别的机场降落。
If it stops snowing we can go out. 如果雪停了，我们就可以出去。
3． if从句用一般现在时，主句用must/should If you want to lose weight you must/should eat less bread. 如果你想减肥，你必须少吃面包。
4． if从句用一般现在时，主句用一般现在时 If you heat ice it turns to water. 也可用will turn如果把冰加热，它就会化成水。
5． if从句用现在进行时，主句用一般将来时 If you are looking for Peter you’ll find him upstairs. 如果你是在找彼得，上楼就会找到他。
6． if从句用现在完成时，主句用一般将来时 If you have finished dinner I’ll ask the waiter for the bill. 如果你吃完了，我就叫服务生来算账 注意 学习“ if “ 引导的条件状语从句的用法,现在总结一下 if 条件句不一般,几个要点记心间; 条件句,放在前,逗号要放句中间。
条件句表可能，主句多用将来时；
条件句表事实，主句常用现在时。
在 if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。如 We can walk there if we cant find a bus . If it rains tomorrow ,we will not go to the zoo. What will you do if you find a panda in danger. 如果 if 条件句谈论的是重复发生和预示要发生的情景和事件，则主从句大多用一般现在时态。如 If bears are in danger ,they attack people. 在 if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若 if 条件句放句首， 从句后面要加逗号，和主句隔开。还要注意前后时态一致原则 请大家思考if引导的条件状语从句是否可以与with或without进行转换，请举例说明 Reading Practice Discuss Love is For example Love is giving someone your last chocolate/forgiveness. Etc. Vocabulary Have a crush on stay away from Be attached to continuing until now Interrupt f eel a strong but temporary attraction to someone Avoid recognize or accept as true Still like someone and want to have a relationship with him/her Nevertheless have confidence or believe in someone Admit in spite of what was just said; however Trust stop someone from speaking by suddenly saying something Post-reading Task 1 翻译句子并用happen造句, 请猜测this在此指代什么 But this has happened before, and it was just a “crush”. Task 2 请找出课文中提到了几种时态，几个我们学过的句型，几种从句 并在课文中画出 Task 3 在文中找出.is one thing, and ..is another的句子并造句 课后练习Choose the correct responses. 1. A What if I get in shape this summer B ________ You might be able to come rock climbing with me. You wont be able to come rock climbing with me. 2. A What will happen if I stop rcising B ________ Well, you wont gain weight. Well, you might gain weight. 3. A What if I get a better job B ________ You wont be able to buy new clothes. Youll be able to buy some new clothes. 4. A What will happen if I dont get a summer job B ________ You may be able to find a roommate when school starts. Youll probably have to find a roommate when school starts. 6 Verb pairs A Which words go with which verbs Complete the chart. □ a cold □ married □ dieting □ relaxed energetic □ touch □ rcising □ weight feel get lose quit energetic ____ ____ ____ ________ ____ ____ ____ B Write sentences with if. Use some of the words in part A. 1. If I feel energetic, I might go for a walk. 2. _______________________________ 3. _______________________________ 4. _______________________________ 5. _______________________________ 6. _______________________________ 7 Complete these sentences with your own ination. Add a comma where necessary. Grammar note Conditional sentences with if clauses The if clause can come before or after the main clause. Before the main clause, add a comma. If I move to a cheaper apartment, Ill be able to buy a car. After the main clause, do not add a comma. Ill be able to buy a car if l move to a cheaper apartment. 1. If I go shopping on Saturday, I might spend too much money. 2. Ill feel healthier _______________________ 3. If I get more rcise ______________________ 4. If I dont get good grades in school ________________________ 5. I might get more sleep _______________________ 6. Ill be happy ________________________ 8 Nouns and adjectives A Complete the chart with another of the word given. Noun