Can and Could in English – Easy Guide for Ability & Polite Requests

 

English Course: "Can" & "Could"

Elementary Level - Ability and Requests

Part 1: Talking About Ability

A. Using "Can" for Present Ability

We use "can" to talk about something we are able to do now (in the present).

Formula: Subject + can + base verb

"I can speak English."

"She can swim very fast."

"They can play the piano."

"He can't drive a car." (Can't is the short form of cannot)

B. Using "Could" for Past Ability

We use "could" to talk about a general ability you had in the past.

Formula: Subject + could + base verb

"When I was five, I could read simple books."

"My grandfather could run very fast when he was young."

"We couldn't find the keys yesterday." (Couldn't is the short form of could not)

⚠️ Important Note: We don't use "could" for a specific action in the past at a specific time. For that, we use "was able to". For example, "Yesterday, I was able to finish my work." (Not "Yesterday, I could finish my work."). But for now, just remember "could" for general past abilities.

Part 2: Making Requests

We use both "can" and "could" to ask people to do things. "Could" is more polite and formal than "can."

A. Using "Can" (Casual/Informal)

Use "can" when you are asking a friend, family member, or someone you know well.

Formula: Can + you + base verb...?

"Can you help me with this bag?"

"Can you pass the salt, please?"

"Can I borrow a pencil?"

B. Using "Could" (Polite/Formal)

Use "could" to be more polite, especially with strangers, older people, or in a shop or restaurant.

Formula: Could + you + base verb...?

"Could you tell me the time, please?"

"Could you open the window?"

"Could I have a glass of water?"

Quick Summary

Situation	Word to Use	Example
Present Ability	Can	I can ride a bike.
Past Ability	Could	I could ride a bike when I was a child.
Informal Request	Can	Can you close the door?
Polite Request	Could	Could you help me, please?

Practice Time!

Exercise 1: Complete the sentences

Fill in the blanks with "can", "can't", "could", or "couldn't".

1. I'm sorry, I ___________ come to your party last Saturday. I was sick.

2. She ___________ sing beautifully. You should hear her!

3. When he was a child, he ___________ speak three languages.

4. It's very dark in here. I ___________ see anything.

5. ___________ you swim when you were five years old?

Exercise 2: Make Polite Requests

Write a polite request for each situation using "could".

1. You are in a cafe. You want to order a coffee.

2. You need to ask a stranger on the street for directions.

3. You are at the dinner table and want your friend to pass the bread.

Answers

Exercise 1:

1. couldn't
2. can
3. could
4. can't
5. Could

Exercise 2 (Possible Answers):

1. "Could I have a coffee, please?"
2. "Excuse me, could you tell me how to get to the station?"
3. "Could you pass the bread, please?"

Great job! You now know how to use "can" and "could" to talk about ability and make requests.

Keep practicing by using them in your daily conversations!