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Modals of Obligation

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on 7 February 2015

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Transcript of Modals of Obligation

ought to
had better not
must not
has to/have to
had better
ought to
has to / have to
had better not
doesn't have to / don't have to
must not
We use modals of obligation to give advice, orders and to permit and prohibit different things.
You must not smoke inside the school.
Students must not use their cell phones in class.

People must not steal.
I must not forget to study!
There's a test tomorrow!
You had better not lie to your parents!

I had better not go to bed late tonight.

I had better not forget to call my friend on her birthday.

You had better not leave your handbag on the table.
Someone might take it!
I really shouldn't eat so much cake.
It's got too much sugar, so it's not healthy.
You shouldn't buy that dress.
It's too expensive.
People shouldn't smoke because it causes cancer.
Your sister shouldn't play video games all night.
She looks really tired today.
had better
Children don't need to bring their passports to school.
You don't have to help me.
I'm OK.
Parents don't need to pay for public school.
It's free.
You don't have to go to school on Saturday.
You should buy that dress!
The color is perfect.
Everyone ought to eat a healthy diet.
I ought to read more.
That would really help my English.
You should always tell the truth.
You had better turn down your music
or the neighbors will start complaining!
I'd better wash my hands before I eat.
I think they're a bit dirty.
We had better feed the cat.
She's really hungry!
You had better pay attention in class,
or you'll miss something important.
You must be quiet in libraries.

Students must be on time for class.
If they are late, they will be marked absent.
If you want good marks, you need to study.
Ferran has to visit his grandmother this weekend.
of obligation
General Rules
need to/needs to
Someone had better put her to bed.
She looks like she's going to fall down!
He had better hurry
if he doesn't want to be late.
There are children in the street.
You had better drive slowly.
You had better stay back from the cliff.
You don't want to fall.
I had better slow down around this corner. It looks dangerous.
Plants need to have
sunlight to grow.
do her homework.
Yesterday, I
to go to class.
"Ought" works like a modal but it always has "to" with it:
You ought
memorize these rules. NEG: You
ought not to
do it.
need to / needs to
don't need to / doesn't need to
of obligation
You had better not let him eat that!
These verbs work like modals but have the 3rd person form ´S´:
She has
to ask
her father.
And they can be used in the past and future:
have to/
to need to/
But they are followed by to+infinitive:
but also
Modals don't take "s" with he, she, or it:
You use "not" to make modals negative:
We should
be late.
Modals are followed by the infinitive of the verb without to:
I should
lunch now.
Yesterday, I
must have gone
to class.
They´re not used in a past or future form:
semi modals
semi modals
for MODAL verbs
don't / doesn´t
have to
don't / doesn´t
need to
remember SEMI MODALS which work differently
You must not smoke here.
You must not steal!
must not
shout at
their parents.
You mustn´t run with scissors.
You must not drive down this street.
You had better not put that in your mouth!
He had better not touch that hot stove!
You had better not
knock on this door.
She shouldn't wait until the last minute.
You shouldn't slouch!
She shouldn't wear those shoes
when she has to walk a lot.
She shouldn't eat all that food.
We don't need to take the stairs.
We could take the lift.
You don't have to drink coffee.
You could drink tea.
We don't need to drive.
We could take the train.
You should brush your teeth after every meal.
She ought to go to bed!
You should be quiet in the library.
She ought to study harder.
Travellers must show their passports.
Fish have to be in water to survive.
Drivers must obey the laws.
It is against the law.
If they do, the teacher will take them.
I have a test tomorrow.
Modal Verbs of Obligation
Semi Modal Verbs of Obligation
Now make sentences with these Modals & Semi Modals.
You mustn´t do that!.
Here are some examples.
You had better not do that!
Can you think of more examples?
Here are some examples.
Can you think of more examples?
Here are some examples.
Can you think of more examples?
Here are some examples.
Can you think of more examples?
Here are some examples.
Can you think of more examples?
Here are some examples.
Can you think of more examples?
Here are some examples.
Can you think of more examples?
have to/has to
ought to
don't have to
doesn't have to

had better
must not
need to/needs to
don't need to
doesn't need to
had better not
Full transcript