A Basic Structure & Example Paragraph
We use can and could to talk about possibilities, choices, and suggestions. Can usually describes a stronger or more realistic possibility, while could often suggests one possible option or a less certain idea. After both modal verbs, always use the base form of the verb.
- We can visit the mall after lunch.
- You could buy a souvenir there.
- They can find many different stores.
- Visitors could explore the local markets instead.
If you're visiting Edmonton, you can explore West Edmonton Mall because it has hundreds of stores and many attractions. You could visit the indoor water park or enjoy a meal in the food court. If you have extra time, you could also browse the local boutiques on Whyte Avenue for unique gifts.
B Can
Use can when something is possible, realistic, or likely to happen. It is also commonly used to suggest practical options that are available now.
- You can find many stores at the mall.
- We can take the bus there.
- She can buy a birthday gift today.
- Visitors can enjoy several attractions in one place.
- You can compare prices before making a purchase.
Tip: Use can when you believe something is a realistic possibility or when suggesting an option that is available now.
C Could
Use could when something is possible, but less certain, or when making a suggestion. Compared with can, could often sounds more polite, less direct, and more flexible because it presents an idea rather than a definite option.
- We could visit Whyte Avenue instead.
- You could try a local boutique.
- They could spend the afternoon shopping.
- We could stop for lunch before going home.
- She could order the item online if it isn't available in the store.
Tip: Use could when offering suggestions or discussing one of several possible choices. It often sounds more polite and less certain than can.
D Negative Forms
Use can't or couldn't to show that something is impossible or not possible. Can't usually refers to the present or future, while couldn't often describes a situation that was not possible in the past.
- We can't park here because it's full.
- She couldn't find her favourite store.
- They can't afford that jacket.
- I couldn't finish my shopping before the mall closed.
- You can't enter the building without a pass.
Tip: Use can't for present or future impossibility, and couldn't for past impossibility or something that was not possible in an earlier situation.
E Questions
Use Can...? and Could...? to ask about possibilities, available options, or to make requests and polite suggestions. Although both forms are correct, could usually sounds more polite and less direct than can.
- Can we visit the mall today?
- Could we try another store?
- Could I buy this online instead?
- Can you help me choose a gift?
- Could you recommend a good restaurant nearby?
Tip: Use can for everyday questions and informal requests. Use could when you want to sound more polite or when making a suggestion.
F Can Be / Could Be
Use can be or could be to describe possible situations, conditions, or characteristics. Can be usually describes something that is generally possible, while could be often expresses a less certain possibility or prediction.
- Shopping during a holiday can be very busy.
- This jacket could be the best choice for winter.
- The line at the cashier could be quite long.
- The roads can be slippery after heavy rain.
- That restaurant could be closed on holidays.
Tip: Use can be when talking about something that is generally or regularly possible. Use could be when you are making a prediction or expressing a possibility that is less certain.
G Past Possibility
Use could have + past participle to talk about something that was possible in the past but did not happen. This structure is commonly used to describe missed opportunities, alternative choices, or different outcomes.
- We could have visited another mall.
- She could have bought the shoes on sale.
- They could have saved more money.
- I could have taken an earlier bus.
- You could have booked your tickets online.
Tip: Use could have + past participle when discussing a past possibility or a missed opportunity. It describes something that was possible, but did not actually happen.
H Key Points to Remember
Remember these key ideas:
- After can and could, always use the base form of the verb.
- Use can to describe realistic possibilities or available options.
- Use could to express less certain possibilities, suggestions, or more polite ideas.
- Use can't for present or future impossibility, and couldn't for past impossibility.
- Use Can...? and Could...? to ask about possibilities, make requests, or offer suggestions. Could...? usually sounds more polite.
- Use can be and could be to describe possible situations, conditions, or characteristics.
- Use could have + past participle to describe a past possibility or a missed opportunity that did not happen.
✓ You can visit the museum tomorrow.
✓ We could try another restaurant.
✓ The roads can be busy during rush hour.
✓ They could have saved more money.
✗ You can to visit the museum.
✗ We could tried another restaurant.
✗ They could have save more money.