use and forms of could and couldn't

1. COULD / COULDN’T

2. USE

3. We use COULD/COULDN’T to talk
about abiltily and possibility in
the past

4. COULD+ INFINITIVE

5. FORMS

6. AFFIRMATIVE
He could speak Japanese
They could visit many places

7. NEGATIVE
He couldn’t speak Japanese
They couldn’t visit many places

8. QUESTIONS AND SHORT ANSWERS
Could he speak Japanese?
Yes, he could/ No, he couldn’t.
Could they visit many places?
Yes, they could/No, they couldn’t