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Modals Verbs

Obligation

Modals in the Present

Modals in the Past

You must / have to stop when the traffic lights are red.

You had to stop.

Advice

Modals in the Present

Modals in the Past

You should see a doctor.

You should have seen a doctor

He has a Rolls Royce. He must be very rich.

He can't be American. His English is terrible.

He must have been rich, He had a big house and an expensive car.

He can't have written that poem, He was illiterate.

Modals in the Present

Modals in the Past

Possibility

Modals in the Present

Modals in the Past

I guess it may / can / could / might have been Lacy on the phone.

It may / can / could / might rain. It's cloudy.

Prohibition

Modals in the Present

Modals in the Past

You mustn't have smoked there.

You mustn't smoke here.

Certainty

Permission

Modals in the Present

Modals in the Past

She could drive her father's car when she was only 15.

Can I go out?

Rodriguez Gongora Rafael de Jesús