OBLIGATION AND NECESSITY


OBLIGATION

Present Obligation: must / have to ==> formula
We use must to talk about internal obligation.
       e.g: You must obey your parents.

We use have to (which is not a modal verb) to talk about external obligation.
       e.g: You have to go up the stairs as the lift is out of order

Past obligation: had to
We use had to to talk about a past obligation.
       e.g: I  had to fill in a form to apply for the job.

(source: whatsupschool.blogspot.com)

NECESSITY

Necessity ==> Need to/ don't need to: in all cases.
      ex: I don't need to wear glasses.
Needn't + infinitive without to: on spesific occasions.
      ex: You needn't bring anything to the party.
Needn't have + past participle/didn't need to + infinitive: You did it but it wasn't necessary.
      ex: I needn't have bought/ I didn't need to buy any juice. I had three bottles in the cupboard!
Didn't need to + infinitive: You didn't do it because it wasn't necessary.
      ex: We had lots of drinks and food at home so we didn't need to go to the supermarket for the party.

(source: slideshare.net)

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