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Can: Ability, Permission, and Requests
Can covers three things: what you're able to do, asking for permission, and asking for a favor. It's always followed by the base form of the verb.
Written by Bryan López, Profesor de inglés · Updated
Can is a modal verb used for three things: talking about ability (I can swim), asking for permission (Can I leave?), and making a request (Can you help me?). It's always followed by the base form of the verb, never with "to."
The 3 uses of can
Always with the base verb, no "to"
"I can to swim" is wrong. Can is always followed by the base form of the verb, with no "to": "I can swim," "She can drive."
How can and can't sound different
In natural speech, "can" is pronounced quickly and weakly (almost like "kn"), while "can't" is pronounced more strongly, with a clearer vowel sound. That difference in sound is the real key to telling them apart when listening, more than the final "t," which can barely be heard sometimes.
Could is more polite than can
For asking permission or making a request, "could" sounds more formal and polite than "can": "Could you help me?" is more courteous than "Can you help me?", even though both are correct.
Common mistakes with can
Adding "to" after can, like "I can to speak English," copying the structure of other verbs. It's also common to use can to talk about the past: "Yesterday I can go" is wrong, for the past you use could or was/were able to: "Yesterday I could go" or "Yesterday I was able to go."
Can for ability: present and past
"Can" says what you are able to do: "I can swim." "She can speak three languages." For the past, English uses "could": "When I was six, I could ride a bike." For a single completed past event, however, we say "was able to": "I was able to finish the report yesterday." The difference is subtle, but it is useful when you want to sound precise.
Practice can with real audio
Interactive exercises, real pronunciation, and the full lesson taught in English.
Can in its four forms
Asking for permission and making requests
Can is also the everyday word for asking permission and making simple requests: "Can I sit here?" "Can you open the window, please?" "Could" is more polite and "may" is more formal. With friends and family, can is perfectly normal. In a hotel, at work, or with a stranger, could is a safer choice.
Examples of can
- Can you pass me the salt, please?
- I can't hear you, can you speak louder?
- She can cook really well.
- We can't go out, it's raining.
- Can I use your phone for a minute?
The 'to' mistake
Incorrect
She can to swim very well.
Correct
She can swim very well.
can in a real conversation
A: "Can you help me with this exercise?" B: "Sure, I can try. What don't you understand?" A: "I can read the text, but I can't answer the questions." B: "Okay, let's look at the first one together."
Can vs. know how to
To talk about a learned skill, English often uses "know how to" as well: "I know how to play the piano" means you learned it. "I can play the piano" says you are able to do it right now. In most everyday conversations, the two are interchangeable, but "know how to" highlights knowledge, while "can" highlights ability.
Frequently asked questions
What is can used for in English?
For talking about ability (I can swim), asking for permission (Can I leave?), and making requests (Can you help me?).
How do you make can negative?
With can't or cannot: "I can't swim." Both are correct, can't is more common in everyday speech.
What's the difference between can and could?
Can is present tense, could is its past form (I could swim when I was young) and also a more polite way to ask for permission or make a request (Could you help me?).
Is "to" used after can?
No. Can is always followed by the base verb with no "to": "I can swim," never "I can to swim."
How do can and can't sound different when spoken?
"Can" is pronounced short and weak, "can't" is pronounced more strongly with a clearer vowel. That's the key to telling them apart when listening, since the final "t" can barely be heard sometimes.
How do you ask for permission with can?
With the structure Can I + base verb: "Can I use your phone?" "Can I leave early today?"
Is can't the same as cannot?
Yes. Can't is the contraction of cannot, which is written as one word. Can not in two words is very rare and is used for special emphasis.
How do you pronounce can and can't?
In a positive sentence, can is usually weak (/kən/). Can't is pronounced with a clear, long vowel (/kænt/ or /kɑːnt/). Listening for this difference is important for understanding real speech.
Does can change with he, she, and it?
No. Can is the same for all subjects: I can, he can, they can. There is no -s and no does in the question: "Can she swim?"
Practice can with real audio
Interactive exercises, real pronunciation, and the full lesson taught in English.
Keep learning
- Would Like: The Polite Way to Ask for Something"Would like" is the polite way to say you want something, more formal than "want."
- The Imperative in English: How to Give Orders and InstructionsThe imperative in English uses the base form of the verb, no subject, and it never changes depending on who you're talking to.
- Verb To Be: Am, Is, Are, Was, Were ExplainedThe 8 forms of English's most important verb, explained with examples and contractions.