Bài soạn UNLESS

UNLESS AND HOW TO USE
UNLESS
Study this example situation:
You can’t come in unless you are a member.
This means:
You can’t come in except if you are a member.
Or: You can’t come in only if you are a member.
 unless = except if
Unless clause Main clause
Present simple
tense
• Present modals +V {(will/can/must/have to/has
to/ought to/may)+V}
• Imperative form (mệnh lệnh cách)
Past simple tense • Past modals +V (would/could/should/might/had to)
EX:
I will see you tomorrow unless I have to work late. (except if I have to work late)
(Present modals +V) (Present simple tense)
Unless Ann askes you, don’t tell her what I said. (except if Ann askes you)
(Present simple tense) (Imperative form)
I don’t like fish. I wouldn’t eat unless I was extremely hungry.
(past modal+V) (past simple)
 We often use unless in warnings:
We will be late unless we hurry.
Unless you work much harder, you won’t pass the exam.
 Instead of unless it is often possible to say if…not:
Unless Ann askes you, don’t tell her what I said
 Don’t tell Ann what I said if she doesn’t ask you.
We will be late unless we hurry.
 We will be late if we don’t hurry.
Fill in IF or UNLESS

1. ___________ he advertises in the newspaper he will sell a lot of goods.
2. ___________ I'm mistaken,that's certainly Mr Jones.
3. ___________ it's very cold,we will probably not have snow.
4. ___________ you use high quality material, you can't build a good house.
5. ___________ you finish work early,we can play tennis.
6. ___________ you don't keep your promises,you 'll lose your friends.
7. ___________ you study hard,you won't get a scholarship.
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UNLESS AND HOW TO USE
8. ___________ you tell me what you want I can get it for you.
9. ___________ you think about it you will make the right decision.
10. She won’t know the truth ___________ you tell it to her
11. ___________ you arrive early, you’ll be able to meet the customers before the meeting.
12. ___________ she eats healthy food, she won’t lose some weight
13. won’t arrive on time ___________ they finish the work early
14. Will she be able to eat some cake ___________ I put eggs in it?


Complete with the suitable verb tense

1.- He ___________ (forgive) you if you ___________ (tell) him the truth.
2.- We ___________ (not pass) the exam unless we ___________ (study) harder.
3.- If she ___________ (take) a painkiller, she ___________ (feel) much better soon.
4.- If your mother ___________ (ask) me, I ___________ (tell) her you went for a walk.
5.- ___________ ( you/buy) the T-shirt if she ___________ (have got) it in your size?
6.- If they ___________ (be) here tomorrow, they ___________ (try) to go to Susan’s party.
7.- ___________ (you/go) to the wedding if she ___________ (send) you an invitation?
8.- If Mark and Sally ___________ (cut) the red wire, the bomb ___________ (explode)
9.- I ___________ (receive) a prize if my composition___________ (win) the contest.
10.- If my boss ___________ (not give) me more work, I ___________ (arrive) home early.

Choose IF or UNLESS and match each beginning with a suitable ending

A B Answers
1. She won’t go to work a.- Sally doesn’t lend me her car 1-
2. Will you take part in the race b.- we spend all the evening working on it 2-
3. I won’t be able to visit you tomorrow c.- she feels better tomorrow 3-
4. The project won’t be ready today d.- the address is written incorrectly 4-
5. I won’t receive the letter e.- your bike is ready to be used? 5-

Rewrite the following sentences:
You must work much harder or you won’t pass the exam.
..............................................................................................................................................................
Listen carefully or you won’t know what to do.
..............................................................................................................................................................
She must apologise to me or I’ll never speak to her again.
..............................................................................................................................................................
You have to speak very slowly or he won’t be able to understand you.
..............................................................................................................................................................
The company must offer me more money or I’m going to look for another job.
..............................................................................................................................................................
You are allowed to enter the club only if you are a member.
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UNLESS AND HOW TO USE
..............................................................................................................................................................
I’m going to the party only if you go too.
..............................................................................................................................................................
The dog will attack you only if you move suddenly.
..............................................................................................................................................................
He will speak to you only if you ask him a question.
..............................................................................................................................................................

The doctor will see you today only if it’s an emergency.
..............................................................................................................................................................
Fill in If/unless/as long as
1. ___________ you have a good reason you must come.
2. You can stay ___________ you like.
3. She can go out ___________ she promises to be back at midnight.
4. ___________ it rains you'll stay at home.
5. He can watch tv ___________ he stays quiet.
6. I won't come ___________ you ask me to.
7. She won't succeed ___________ she practises regularly.
8. He'll eat out ___________ he has too much to do.
UNTIL VS. UNLESS
Until A will only occur once B is done (the longer it takes to do B, the longer it will be until A
happens. i.e. A happens immediately after B.)
Example 1: He never caught a fish until his father showed him how. (Once his father showed him
how to catch fish [B], he caught one [A].)
Example 2: We can't use the playground until they catch the snake that is out there. (Playing on the
playground [A] will not occur until catching the snake [B] occurs.)
Unless If B is not done, A will not occur. (B may occur anytime before A.)
Example: He never would have caught any fish unless his father had shown him how. (He would
have gone on failing forever -- situation shown on top line -- if he had not been taught how to fish.
Sometime after being taught, he succeeded in catching one [A occurred].)
Example 2: We can't use the playground unless they have already caught the snake. (If B - catching
the snake - occurred at some point in the past, then A -- playing on the playground -- can happen.)

1. I won't get a birthday present from Joe ___________ I invite him to my party.

2. My feet get cold ___________ I wear socks.
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UNLESS AND HOW TO USE

3. She runs ___________ she is out of breath.

4. I can't go on the field trip ___________ my mom sends in a permission slip before the deadline.

5. I stay in my classroom ___________ it is time to go to P.E.

6. She is not allowed to get her ears pierced ___________ she is 13 years old.

7. I cannot wait ___________ school gets out for the summer.

8. I'm going to Disney World in two weeks ___________ my dad's car is still broken.

9. Sailboats can't move ___________ the wind blows.

10. He did not come to the cafeteria ___________ lunch was half over.

11. I will meet you at the theater at 5:00 ___________ I have to stay late at work.

12. ___________ you want to be sent to the dean's office, you need to sit down and do your work.

13. He's going to work on the car ___________ it runs properly.

14. They played at the pool ___________ the storm came and the lifeguard told everyone to get out.

15. Our dog jumped on visitors _________we took a dog obedience course and taught him to "stay."

16. I'm not going to be able to afford to go on the trip ___________ I win the lottery.
In case/unless
1. Emma won't call you ___________ you give her your phone number.

2. Take a map with you ____________ you can't find the hotel.
3. Ask for a receipt __________ you need it later.
4.______________ fire, press the red button.
5. I won't lend you my car ____________ you promise to drive carefully.
6. The alarm won't work ____________ you turn it on.
7. We got a second key ____________ we lost the first one.
8. Call this number ______________ emergency.
9. Take your vaccination certificate with you ___________ they ask for it at the airport.
10. I'll see you at the meeting next week_____________ it's cancelled before then.
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