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Need to, have to and must.

Presentation made to differentiate obligations and necessities.
by

Leví Pérez Peredo

on 20 November 2014

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Transcript of Need to, have to and must.

Need to, Have to and Must
How to use it...
When to use it...
And more...

Here you have two uses:
Lets start with
"Must"
1) We use "must" for giving strong advice and to make some recommendations to others based on our own opinions.
For instance:
I must try to go bed early tonight.
You must eat less sugar.
He must do his homework and study.
She must buy new clothes.
2) We use "must" for stating rules, especially in formal English.
For example:
Cyclist must wear helmets.
Teachers must wear suit or dress.
You must be quiet in classes.
These sentences are formed like this:
Subject + must + verb + complement.

As you see it is not necessary to conjugate must.
To express prohibition you can use "must not" or you can also use the contraction "mustn't"
We can also use "must" to express prohibition
For example:
You mustn't talk in the library.
Children mustn't play with knives.
You mustn't touch the walls.
How to form it..
Subject + must not (mustn't) + verb + complement
We use "have to" to talk about obligations
Have to
Examples:
We have to speak only in English.
I have to prepare classes.
You have to go to work.
Examples:
He has to feed the dog.
She has to do the house work.
Your father has to bring money every day.
Jaquelin has to pass her exam.
To create sentences to express obligations you need:

Subject (I, you, we they) + have to + verb + complement.

Subject (he, she, it) + has to + verb + complement.
Negative form
When we use it in a negative form, "have to" expresses lack of obligation, it does not expresses prohibition.
For example.
You don't have to go to school today.
You don't have to clean your room this week.
I don't have to work this Sunday.
He doesn't have to visit his mother.
She doesn't have to see his boyfriend.
Formula:

Subject (I, you, we, they)+ do not (don't) + have to + verb + complement.

Subject (he, she, it)+ does not (doesn't) + have to + verb + complement.
"Need to" expresses a necessity.
Need to
Example:
I need to go to the bathroom.
We need to study more.
You need to learn this topic.
More examples:
He needs to learn spanish
She needs to brush her teeth.
It needs to have a bath.
How to form it:
Subject (I, you we, they.)+ need to + verb + complement.
Subject (He, she, it) + needs to + verb + complement
The negative expresses the lack of necessity.
The negative
You don't need to open the windows.
I don't need to study spanish
He doesn't need to buy a new computer.
She doesn't need to call me.
Formula:

Subject (I, you, we, they)+ do not (don't) + need to + verb + complement.

Subject (he, she, it)+ does not (doesn't) + need to + verb + complement.
Presentation made by
Professor Leví Pérez Peredo
Full transcript