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Domingo Chica / @dchicapardo

Expresión de la modalidad:

"must"

What are the modal verbs?

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Permission

Obligation
Possibility
Ability
Prohibition
Advice

1. Uses of "must" / "mustn't"

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Obligation

1. Uses of "must" / "mustn't"

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Obligation

Necessity

1. Uses of "must" / "mustn't"

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Obligation

Necessity

Prohibition (in negative forms)

Formation in affirmatives

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Subject must + infinitive without "to"

Formation in affirmatives

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Peter must wash the dishes

Subject must + infinitive without "to"

Formation in affirmatives

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Peter must wash the dishes

Subject must + infinitive without "to"

Susan must be punctual

Formation in affirmatives

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Peter must wash the dishes

Subject must + infinitive without "to"

Susan must be punctual

They must park here

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Formation in negatives

Subject must + not +

infinitive without "to"

Peter must not wash the dishes

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Formation in negatives

Subject must + not +

infinitive without "to"

Peter must not wash the dishes

Susan must not be punctual

Domingo Chica Pardo - @dchicapardo

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Formation in negatives

Subject must + not +

infinitive without "to"

Peter must not wash the dishes

Susan must not be punctual

They must not park here

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Formation in questions

Inversion

Peter must be punctual

Must Peter be punctual?

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Formation in questions

Inversion

The kids must follow the rules

Must the kids follow the rules?

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Formation in questions

Inversion

The story must have a happy ending

Must the story have a happy ending?

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"must" vs "have to"

"Must" for external obligation

The students must pay the fees

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"must" vs "have to"

"Must" for external obligation

The students must pay the fees

"have to" for personal obligation, necessity

They have to get ready before 6

Domingo Chica Pardo - @dchicapardo

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