English Class

​obligation and necessity

grammar ​

1. ​I MUST PAY THAT BILL BEFORE THEY CUT OFF MY PHONE.

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2. ​​​YOU MUST SEE HER LATEST FILM, IT´S WONDERFUL!

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​EXAMPLES :

1. TO TALK ABOUT OBLIGATION THAT COMES FROM THE SPEAKER. SOMETHING THE SPEAKER FEELS IS NECESSARY

2. TO MAKE A STRONG RECOMMENDATION​

​

​MUST

​WE USE MUST :

​

1. YOU MUSTN´T TOUCH THAT SWITCH; YOU COULD GET AN ELECTRICK SHOCK. ​

2. YOU MUSTN´T TALK IN THE LIBRARY​.

​EXAMPLES :

1. TO EXPRESS PROHIBITION​

​WE USE MUSTN´T :

​MUSTN´T

MUSTN´T is the negative form of MUST ​

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1. ​YOU HAVE TO FILL IN A FORM IF YOU WANT TO APPLY FOR A COURSE.

​EXAMPLES :

1. TO TALK ABOUT EXTERNAL OBLIGATION. SOMETHING ​THAT IS NECESSARY BECAUSE OF A RULE OR LAW.

​WE USE HAVE TO :

​have to

​The past form is HAD TO. For example: I was a shop assistance. I had to serve customers and keep the shop tidy.

​You have to wear uniform at school.

1. YOU DON´T HAVE TO BRING SANDWICHES, LUNCH IS PROVIDED. ​

​EXAMPLES :

1. TO TALK ABOUT SOMETHING THAT ISN´T NECESSARY ​

​WE USE DON´T HAVE TO :

​don´t have to

The past form is didn´t have to. For example: We didn´t have to walk home. Patty gave us a lift.​

1. YOU NEED TO FILL IN A FORM IF YOU WANT TO APPLY FOR A COURSE. ​

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2. YOU DON´T NEED TO BRING SANDWICHES, LUNCH IS PROVIDED. ​

​examples :

IN THE SAME WAY AS HAVE TO/DON´T HAVE TO:

1. We use ​NEED TO to talk about an obligation.

2. We use DON´T NEED TO to talk about something that isn´t necessary. ​

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​we use need to/don´t need to :

​need to / don´t need to

1. ​YOU SHOULD TALK TO YOUR MANAGER ABOUT THE PROBLEM.

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2. YOU SHOULDN´T GO TO THE CINEMA TONIGHT. ​

​examples :

​TO GIVE ADVICE

1. We use SHOLUD to say what we think is a good idea.

2. We use SHOULDN´T to say what we think isn´t a good idea. ​

​WE USE SHOULD/SHOULDN´T :

​

​SHOULD / SHOULDN´T

1. ​YOU ARE SUPPOSED TO GIVE YOUR SIT TO A PREGNANT WOMAN.

2. YOU´RE NOT SUPPOSED TO BRING DRINKS INTO THE COMPUTER ROOM. ​

​EXAMPLES :

1. TO TALK ABOUT RULES THAT PEOPLE ARE EXPECTED TO FOLLOW, BUT WICH ARE OFTEN NOT RESPECTED. ​

​we use be supposed to :

​be supposed to