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uncertainty

He could call you back tonight.

We could choose a new color of paint for the bedroom.

She could decide to join us.

we are not sure if something is true

It's quite bright. It might not  / may not rain today.
He may / might not remember

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Abilities and Possibilities present, past, and future

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Abilities and Possibilities present, past, and future

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Form
Subject + Can/Could + infinitive without to

Use
To talk about abilities and possibilities

Can
It's more common to talk about abilities in  the present
Example: Nowadays we can investigate different topics on the internet.

Couldn't
We only can use Couldn't talk about particular possibilities in the past.

Was/Were able to
We can use able to instead of could
Example:
-I was able to buy this book yesterday.
-When I was able to travel in France, I couldn't speak French.

Could and Couldn't
To talk about what people, in general, could do in the past
Example:
-We couldn't send text messages 200 years ago

Be able to
Can also be used in the present and the past(it's more formal). Also, we can use be able to when we talk about abilities and possibilities in the future.

Can
When we have decided about something in the future
I finish class today, so I can rest today

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Could is similar to Can and often replaces Can in the past tense (though not always)

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1. To express ability in the past
2. Polite word used to ask for permission or to request something (in the present)
3. General permission in the past
4. A suggestion when asked what to do (choices and opportunities)
5. Couldn't: Sure that something is untrue
6. Could + have + past participle: To express a possibility in the past
7. Could + have + past participle: Unrealised past ability
8. Could: A conditional form of Can

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Could, Might and May: Possibility and deductions.

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Could, Might and May: Possibility and deductions.

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Differences and similarities
We use may and might to talk about possibility in the present and future and make deductions
might and could can suggest more uncertainty than may
We can use may not and might not when we are uncertain if something is true but not couldn't.
We use couldn't or can't when we are certain that something is not true.

Examples :

Could.
*She could be lost.
*My mom could be at home

Might
*She might come soon.
*She might go to the party tomorrow if you ask her

May
*She may be in the wrong room
*He may have the answer to the exam

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When we use could, may and might they are a similar structure:
Subject + Modal (Could/ May/ Might) + infinitive without to.
In negative we can use may not or might not.
we cant use Could not or Could'nt and Can't because we use this when we are certain that something is not true

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Estructure
Modal verb + have + -ed form

Differences and similarities

>Must have: 100 % I am sure.
>Couldn't-can't  have: 100% is not true.
>Other modal verbs: (Could,might, many and might not) + have

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Team 2 -> Ability and posibility: Present, past and future Differences and similitaries

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Team 2 -> Ability and posibility: Present, past and future Differences and similitaries