Can vs Could
Understanding the Difference Between "Can" and "Could"
"Can" and "could" are both modal verbs used to express ability, possibility, permission, and requests, but they have different meanings depending on the context. Let’s explore their correct usage.
When to Use "Can"
Use "can" when talking about present or general abilities, permissions, or possibilities.
✅ Examples:
I can swim. (Ability)
You can borrow my book. (Permission)
We can go to the park if it stops raining. (Possibility)
Can you help me with this? (Request)
When to Use "Could"
Use "could" in these cases:
Past Ability
When I was a child, I could run fast.
Polite Requests or Offers
Could you please open the window?
Hypothetical or Uncertain Possibilities
It could rain later.
Permission (More Polite/Formal than "Can")
Could I leave early today?
Key Differences
"Can" is used for present or general ability, while "could" is used for past ability.
"Can" is more direct, while "could" is more polite or uncertain.
"Could" is used for hypothetical situations, whereas "can" is for real possibilities.
Common Mistakes and How to Fix Them
❌ I can run fast when I was younger. → ✅ I could run fast when I was younger.
❌ Can you lend me some money? (Informal) → ✅ Could you lend me some money? (More polite)
Final Tips
Use can for present abilities and direct requests.
Use could for past abilities, polite requests, and uncertain possibilities.
