Grammar Reference Unit 1

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GRAMMAR REFERENCE

OBLIGATION MUST / HAVE TO

We use must or have to to express obligation or nessecity.

We use had to to express obligation or nessecity in the past.

We use musnt´t to show that something is forbidden.

We use don´t have to to express a lack of obligation and necessity in the present.

We use didn´t have to to express a lack of obligation and necessity in the present.

We use will have to to express a lack of obligation and necessity in the present.

GRAMMAR REFERENCE

ADVICE SHOULD, OUGHT TO,HAVE TO

We use should and ought to to give advice or to make a strong suggestions for the present, the future or generally.

We use had better to give advice or make a strong suggestion about an inmediate situation.

We use had better not (NOT hadn´t better) for advice or strong suggestion about what not to do in the present.

http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-videos/have-must-and-should-obligation-and-advice

http://www.aulafacil.com/cursos/l22658/idiomas/ingles/ingles-repaso-de-gramatica/must-have-to

https://www.youtube.com/watch?v=kZ3rHYcWFlA

http://www.agendaweb.org/verbs/modals-must-have-to-exercises.html

http://institucional.us.es/aiidi/Lev2/Grammar/L2File5C_ModalsOfObligation.pdf

ELC Study Zone: Modals of Advice 1 - Should, Ought to, Had Better

English Exercises: SHOULD, OUGHT TO, HAD BETTER Expressing Advice. (Author-Bouabdellah)

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