MUST

• Must is used in all tense and time. It has no past tense, no infinitive and no participate. In indirect speech 'had to' is used as the past tenses of must.

For Example:-

The boy said, 'I must go to school'.

The boy said that he had to go to school.

• Must is used to express the obligation, duty, necessity and probability.

For Example:-

We must be punctual in every work.

We must pay your tuition fees regularly.

We must feed the workers after the hard work.

• Must is used to express a strong determination.

For Example:-

We must see the Konark temple next winter.

They must finish the construction of the bridge before the rainy season. 

• Must expresses inevitability.

For Example:-

All must die one day.

Corruption must rain the society.

• In the negative form must not expresses prohibition and not absence of obligation.To express  the absence of obligation needn't is used.

For Example:-

You mustn't drive fast in the narrow road ( prohibition ).

you needn't drive slowly in the wide road ( absence of obligation).

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