/You should see a doctor./ - /You should have seen a doctor./
Međutim kod određenih glagola ne dolazi da ovakve promene. Modalni glagoli "can, will, shall, may" već imaju svoje odgovarajuće oblike u prošlosti, a to su "could, would, should i might". Drugačija promena se dešava I glagolu "must", koji u prošlosti postaje "had to". U sledećoj tabeli vidimo šta se tačno dešava svakom modalnom glagolu kada se prebaci u prošlost:
| Modals in the Present | Modals in the Past | |
|---|---|---|
| Obligation | You must / have to stop when the traffic lights are red. | You had to stop. |
| Advice | You should see a doctor. | You should have seen a doctor. |
| Prohibition | You mustn't smoke here. | You mustn't have smoked there. |
| Ability | I can run fast. | I could run fast. Now I am old. |
| Certainty | He has a Rolls Royce. He must be very rich. He can't be American. His English is terrible. | He must have been very rich. He had a big house and an expensive car. He can't have written that poem. He was illiterate. |
| Permission | Can I go out? | She could drive her father's car when she was only 15. |
| Possiblilty | It may / can / could / might rain. It's cloudy. | I guess it strong>may / can / could / might have been Lacy on the phone. |
| Lack of necessity | You don't have to / needn't buy any tomatoes. There are plenty in the fridge | You didn't have to / didn't need to buy tomatoes. |
| Possiblilty | It may / can / could / might rain. It's cloudy. | I guess it strong>may / can / could / might have been Lacy on the phone. |
"Should have", "could have", "would have" se ponekad zovu I modali nekadašnjih mogućnosti, pošto opisuju situacije iz prošlosti koje zamišljamo da su mogle biti drugačije. Razlika je u tome da se "should" koristi za savete I predloge, "could" za mogućnosti a "would" za iskazivanje želja, samo se u ovom slučaju primenjuju u prošlosti.
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