Modals connected with expressing obligation, prohibition, necessity, certainty, uncertainty, purpose and intention

1. 1
MUST and Have to
We use Must to give orders to ourselves or other people .The obligation comes from
the speaker.(I personally feel it is necessary)
I really must stop smoking
You must be here before eight o´clock
I must post this letter before six o´clock.
Mustn´t is used to express prohibitions or an obligation not to do something.
You mustn´t smoke in class.
You must´nt forget your keys.
We use Have to to talk about an obligation that comes from outside – perharps
because of a law, or a ´rule´, or because some other person has given orders.
Compare:
I must give up smoking.( I want to )
I ´ve got to stop smoking.Doctors orders.
I have to work late tonight .My boss says so.

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Necessity
a-Modal auxiliary
We needn´t reserve seats for the show, there´ll be plenty of room.
We needn´t explain this subject .The students have understood.
b-Ordinary verb
Everybody needs to rest sometimes.
Do we need to arrive so early?
No, it isn´t necessary.
You needn´t wash those dishes.They are already clean.
I didn´t have to go to the doctor´s.The temperature dropped and I felt much
better.

3. 3
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Certainty and Uncertainty , May and Might
Messi may be transferred to another European team
Messi might come back to Argentina to live and play .
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4. 4
Purpose and Intention
We often use the infinitive to talk about a person´s purpose –why he or she does
something.
I sat down for a minute to rest.
I´m going to Austria to learn German.
He got up early to study for the test.
Intention
-I intend to buy a new bycicle.
I have no intention of going to Perú.
Where do you intend to spend your holidays next Summer?
Going to + infinitive is very commonly used to indicate intention
He is going to buy a new bicycle.
We are not going to have this tree cut down

5. 5
Are you going to take this examination?
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