A. IfB. UnlessC. WhetherD. When
5. I won’t get to the party on time _____ I catch the first train tomorrow morning.
A. IfB. UnlessC. WhetherD. When
6. —Shall we go on a picnic this weekend? —Good idea! Unless it _____.
If I start after dinner, I’ll finish it before I go to bed.如果我晚饭后开始，睡觉前我就能完成。
主句也可用“情态动词+动词原形”
She may come with us if she arrives in time.如果她来得及时，就可以和我们一起去。
If you want to know more about it, call now.如果你想了解更多内容，现在就打电话吧。
Make sure you visit the Science Museum if you ever go to London.如果你去伦敦，一定要去参观科学博物馆。
2、主将从现
2. We will go camping if it _____ tomorrow.
A. Won’t rainB. didn’t rainC. doesn’t rainD. isn’t raining
3. I’m waiting for my friend. If he _____, I _____ swimming alone.
Take enough money with you, _______ _______ _______ buy the dictionary.
3. If there is no air, none of us can live.
None of us can live _______ _______.
10. You will get a toothache ________ you do clean your teeth regularly.
（二）用所给单词的适当形式填空
1. If he ________ (get) a low mark in the test, he ________ (study) harder.
5、as/so long as只要
You may use my dictionary as/so long as you don’t keep it too long.只要使用时间不太长，你可以用我的词典。
You can take my car as/so long as you drive carefully.你可以用我的汽车，只要你小心点儿开。
2. If you ________ (swim) every day this summer, you ________ (be) very healthy.
3. If he ________ (not hurry), he ________ (not see) the beginning of the match.
8. Nobody can learn maths well _____ he works hard on it.
A ifB unlessC thoughtD however
9. If fish _____ away from water, they _____ die.
A are taking, won’tB are taken, willC are being taken, willD take, won’t
练习
（一）if not与unless相互替换
1. He will not go unless I come with her.
_____________________________________________
2. If you don’t finish it, I will be angry.
4. You can’t go out unless you ________ (finish) your homework.
5. Unless I save my money carefully, I ________ (not be) able to buy a football.
6. If it ________ (not rain) tomorrow, we ________ (go) to the park.
_____________________________________________
3. Unless I am mistaken, I’ve seen that man before.
_____________________________________________
4. You won’t get a good job, unless you work hard.
unless = if not
You’ll be late if you don’t hurry. = You’ll be late unless you hurry.
I can’t catch the train if I don’t get up early. = I can’t catch the train unless I get up early.
10. The man ________ (set off) if he ________ (buy) the air ticket.
（三）单项填空
1. If I _____ his phone number, I will tell you.
A. findB. foundC. will findD. have found
练习
（一）句型转换
1. Run fast, or you’ll be late for school.
_______ you _______ _______ fast, you’ll be late for school.
2. You can buy the dictionary if you take enough money with you.
A. rainsB. doesn’t rainC. rainD. won’t rain
7. —Can I change the jacket for another one _____ it doesn’t fit me well? —Of course.
A. unlessB. ifC. thatD. though
练习
（一）用if或unless填空
1. ________ he wants to see me, you can tell him to wait.
2. ________ it snows tomorrow, we’ll have a day or two off.
3. We won’t go to his party ________ he invites us.
注意：
1.要点齐全，适当发挥；
2.从思维导图Sayings部分，选择恰当的格合理利用在短文中；
3.词数：100词左右；
【答案】例文
Travelling is one of the best ways for learning. You may have read or heard about something, but you can never get an exact picture of it until you see it yourself. Seeing is believing. If you are a careful observer, you can learn much during your travel about the geography, biology, and history of the places you visit. You can also create great memories for your lifetime. Furthermore, while travelling, you can meet more people and make more friends. No matter how well educated you are, there is always a lot for you to learn through travelling.
3、if条件状语从句和并列句的转换
Hurry up, or you’ll be late. = If you don’t hurry up, you’ll be late.
Study hard and you will pass the exam. = If you study hard, you will pass the exam.
7. I won’t buy that backpack ________ it cosห้องสมุดไป่ตู้s less than $20
8. ________ I’m tired; I’ll have a rest for tea.
9. You won’t get paid for time off ________ you have a doctor’s note.
7. If he ________ (return) to the school, I ________ (let) you know.
8. He ________ smoke unless he ________ (have) enough money.
9. They can remember it better if someone ________ (give) them some advice about it.