THeory +1
Must and have to are both used to talk about obligations: things you cannot choose not to do.
True or False?
True
You use 'have to' to give advice or express your opinion.
True or False?
False
You use 'should' to give advice or express your opinion.
Tomorrow is Sunday! So I______ go to school!
a. should't
b. don't have to
c. mustn't
Tomorrow is Sunday! So I don't have to go to school!
All passengers ____ exit at the next stop.
a. don't have
b. have to
c. has to
All passengers have to exit at the next stop.
Fill in the blanks
If you want to work in the USA you ___________ speak good English.
Have to
Which is used for
-obligations in formal, written English:
Must or have to ?
Must
All employees must wash hands.
Use have to for
-most obligations in spoken English.
True or False ?
True
Example:Do you have to work tomorrow?
If you see Pauline, you _____be polite to her!
a. should
b. must
c. have to
If you see Pauline, you should be polite to her!
I think it's a bad idea to lie to people.
Retell the sentence by using modals.
have to/must/should
You shouldn't lie to people.
You are ill. You ____________ go to school today.
Should not
______is used to show that a person is obliged to do something, usually by an outside force.
must/have to/ should
Have to
A:"I have a terrible stomachache."
B:"You ______ go to the doctor's."
a.should't
b.Should
c.don't have to
Should
He's giving an advice.
You ____ watch so much television.
a. should't
b. don't have to
c. mustn't
You mustn't watch so much television.
You don't need to pay in cash.
Retell the sentence by using modals.
have to/must/should
You don't have to pay in cash.
6. Tomorrow is Sunday! So I ____________ go to school!
have to
What is used when saying something is not necessary to do ?
Don't have to
We use _______ to express prohibition.
Mustn't
Example: Passengers must not talk to the driver while the bus is moving.
Yesterday I ________ finish my geography project.
a. must
b. mustn't
c. had to
Yesterday I had to finish my geography project.
Have to can be used in all tenses.
It's forbidden to enter the computer lab.
Retell the sentence by using modals.
have to/must/should
You mustn't enter the computer lab.
If you see Pauline, you ___________ be polite to her!
should
Can you tell the difference?
Must not means that something is forbidden. You are not allowed to do this.
Don’t have to means that something is not necessary. You can choose to do something or not.
_______expresses impersonal obligation. The subject of ____ is obliged or forced to act by a separate, external power (for example, the Law or school rules). It is objective.
Fill in the blank with: Should/ Must/ Have to
Have to
Angela, you _____ leave your clothes all over the floor like this.
a. mustn't
b. must
c. have to
Angela, you mustn't leave your clothes all over the floor like this.
It's a good idea to set the volume on your MP3 player at a low level.
Retell the sentence by using modals.
have to/must/should
You should set the volume on your MP3 player at a low level.
Dont worry! I´ve a note on the freezer that says: ¨You _________ the lunch with our neighbours!¨
must not