🗺️ COULD GRAMMAR MAP

PAST ABILITY (Could = Was/Were able to)

Expresses general capability in the past.

(+) Positive S + could + V(bare)

(-) Negative S + couldn't (could not) + V(bare)

(?) Question Could + S + V(bare)?

POLITE REQUESTS & POSSIBILITIES

Used for polite requests now or present/future possibility.

(+) Positive Could you help me? • It could rain later

(-) Negative He couldn't be at home now

(?) Question Could I open the window?

1. Form & Structure

Main Functions of Could

1. Past General Ability: When I was 5, I could swim very well.
2. Polite Requests: Could you pass me the salt, please?
3. Polite Permission: Could I borrow your pen for a second?
4. Present/Future Possibility: Take an umbrella. It could rain later.

Example / Question	Positive / Short Answer	Negative / Short Answer
Could you open the door?	Yes, of course. / Sure.	Polite answer to request
Could he swim when young?	Yes, he could.	No, he couldn't.

2. Key Rules & Formation

Rule	Base / Standard Form	Applied Form
Bare Infinitive Rule	Always use bare V1 after "could"! Never add "to" or "-s".	could run (NOT "could to run" or "could runs")

3. Practical Usage & Examples

1. Softening Requests & Expressing Past Skills

Make requests sound more polite than using "can".

Could you speak more slowly, please?
My grandfather could speak four languages.

4. Signal Words & Usage Context

couldcouldn'tCould you...?Could I...?when I was young

Politeness Checklist:

Use "Could you...?" for polite requests in restaurants or public places.

💡 Common Mistakes & Memory Tips

Mistake 1: Adding "to" after could
❌ Incorrect: Could you to help me?
✓ Correct: Could you help me?
Note: Could takes bare infinitive.

❓ Frequently Asked Questions (FAQ)

Q1: Is "could" just the past tense of "can"?

Not always! "Could" is the past tense of "can" for ability, BUT it is also used for present polite requests ("Could you help me?") and present possibility.

1. Form & Structure

Main Functions of Could

1. Past General Ability: When I was 5, I could swim very well.

2. Polite Requests: Could you pass me the salt, please?

3. Polite Permission: Could I borrow your pen for a second?

4. Present/Future Possibility: Take an umbrella. It could rain later.

Example / Question	Positive / Short Answer	Negative / Short Answer
Could you open the door?	Yes, of course. / Sure.	Polite answer to request
Could he swim when young?	Yes, he could.	No, he couldn't.

2. Key Rules & Formation

Rule	Base / Standard Form	Applied Form
Bare Infinitive Rule	Always use bare V1 after "could"! Never add "to" or "-s".	could run (NOT "could to run" or "could runs")

Could

1. Form & Structure

Main Functions of Could

2. Key Rules & Formation

3. Practical Usage & Examples

1. Softening Requests & Expressing Past Skills

4. Signal Words & Usage Context

💡 Common Mistakes & Memory Tips

❓ Frequently Asked Questions (FAQ)

Q1: Is "could" just the past tense of "can"?

Could

1. Form & Structure

Main Functions of Could

2. Key Rules & Formation

3. Practical Usage & Examples

1. Softening Requests & Expressing Past Skills

4. Signal Words & Usage Context

💡 Common Mistakes & Memory Tips

❓ Frequently Asked Questions (FAQ)

Q1: Is "could" just the past tense of "can"?

Other Modal Verbs lessons

Practice Exercises

Could for Past Ability

Could for Polite Requests & Possibility

Could for Gentle Permission & Asking Inquiries

Could for Present & Future Suggestions

Could vs Can in Everyday Contexts

Could & Couldn't in Daily Challenges & Achievements