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Perfect modals

karla Garcia

Created on April 16, 2021

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Transcript

Deductions about the past

Must

We use must to make deductions about the past when we are very sure that something is true. It must have been done by aliens.

Must

Can't

Couldn't

modals

CouldMight May

Can't and couldn't

We use can't and couldn't when we are very sure that something wasn't true. It couldn't have been replaced by a copy.

We use could have, might have, may have and might not have when we are not sure about what happened in the past.He may have overslept

deductions about the past

Modal + have + verb pp.

Ability and possibility

could, couldn't, was /were not able to talk about possibilities in the past. You could travel by train. People was able to smoke in planes

Can and be able to talk about possibilities.You can find the answer online. She is not able to solve the mystery.

Was / were no able and couldn't to talk about particular possibilities in the past.The couldn't understan that topic at the begining.

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