Can/ can't; could/couldn't

Front

What does 'can' express in a sentence?

Back

'Can' expresses ability or possibility.

Front

What does 'can't' indicate in a sentence?

Back

'Can't' indicates inability or impossibility.

Front

What does 'could' express in a sentence?

Back

'Could' expresses past ability or a possibility.

Front

What does 'couldn't' indicate in a sentence?

Back

'Couldn't' indicates past inability or impossibility.

Front

Provide an example of 'can' in a sentence.

Back

I can swim very well.

Front

Provide an example of 'can't' in a sentence.

Back

I can't go to the party tonight.

Front

Provide an example of 'could' in a sentence.

Back

When I was younger, I could run fast.

Front

Provide an example of 'couldn't' in a sentence.

Back

I couldn't finish my homework yesterday.

Front

What is the difference between 'can' and 'could'?

Back

'Can' is used for present ability, while 'could' is used for past ability.

Front

What is the difference between 'can't' and 'couldn't'?

Back

'Can't' is used for present inability, while 'couldn't' is used for past inability.