Grammar: Modal Verbs
A2 Lesson 18: Ability & Possibility with 'Can'
When to Use 'Can'
'Can' is a special helping verb called a modal verb. It adds meaning to the main verb. 'Can' is very easy because it never changes! We use it to talk about two main ideas.
To talk about skills and things you know how to do.
Example: I can speak Khmer. She can't swim.
To talk about what is possible or what you are allowed to do.
Example: You can buy a SIM card at the airport. You can't park your moto here.
The Grammar Rule 📖
How to Use 'Can' and 'Can't'
| Form | Structure | Example |
|---|---|---|
| Positive (+) | Subject + can + [Base Verb] | He can cook amok. |
| Negative (-) | Subject + can't + [Base Verb] | We can't go today. |
| Question (?) | Can + Subject + [Base Verb]? | Can you help me? |
Remember: The main verb is always the simple base form (go, eat, speak). Never use 'to' or '-ing' after 'can'.
Practice Your Grammar 🎯
Exercise: Unscramble the Sentences
Put the words in the correct order to make a sentence or question.
- ( ride / I / a bicycle / can )
→ I can ride a bicycle. - ( you / Can / recommend / a good hotel / ? )
→ Can you recommend a good hotel? - ( use / can't / I / this computer )
→ I can't use this computer. - ( speak / she / three languages / can )
→ She can speak three languages.
Your Grammar Mission ⭐
What Can You Do?
Write three true sentences about yourself. Write two things you can do, and one thing you can't do.
Example: I can ride a moto. I can use a smartphone. I can't speak Korean.
Key Vocabulary
- Modal Verb A helping verb (like will, can, should) that adds extra meaning to the main verb.
- Ability The skill or power to do something.
- Possibility The fact that something might exist, happen, or be allowed.