can
To be able to; to have the ability to do something.
Can is the essential tool for expressing what you are capable of doing right now.
Word in 30 Seconds
- Used to express ability or capability.
- Used to ask for or grant permission.
- Followed by the base form of a verb.
Summary
Can is the essential tool for expressing what you are capable of doing right now.
- Used to express ability or capability.
- Used to ask for or grant permission.
- Followed by the base form of a verb.
Remember the base verb rule
Never add 'to' or 's' after 'can'. It is always 'can swim', not 'can to swim' or 'can swims'.
Avoid double modals
You cannot use two modal verbs together. Do not say 'I will can go', instead use 'I will be able to go'.
Politeness variations
While 'Can I...' is common, native speakers often use 'Could I...' or 'May I...' to sound more polite in formal settings.
Examples
4 of 4I can swim across the lake.
Can I use your phone, please?
You can leave whenever you want.
Heavy rain can cause flooding.
Word Family
Memory Tip
Think of 'CAN' as 'Capability And Nature'. If it is in your nature or capability, you CAN do it!
Overview
'Can' is one of the most frequently used modal verbs in the English language. It is primarily used to describe what a person or thing is capable of doing. Because it is a modal verb, it does not change form (no 's' in the third person) and is followed by the base form of the main verb without 'to'. Usage Patterns: The structure is simple: [Subject] + [can] + [base verb]. For negatives, we use 'cannot' or 'can't'. For questions, we invert the subject and 'can' (e.g., 'Can you swim?'). Common Contexts: We use 'can' for physical ability (I can run fast), mental ability (I can speak French), or permission (Can I go now?). It is also used to express general possibilities or theoretical occurrences. Similar Words Comparison: 'Can' is often compared to 'could' and 'be able to'. 'Could' is the past tense of 'can' or a more polite/tentative version of the present tense. 'Be able to' is a phrase that can be used in all tenses, whereas 'can' is restricted to the present. Using 'be able to' is often necessary when you need to use a tense other than the present, such as the future ('I will be able to help you') or the perfect ('I have been able to finish it'). Understanding these nuances helps learners sound more natural and accurate in various social and professional settings.
Usage Notes
Can is used in both formal and informal registers. It is the standard way to express capability. In very formal writing, 'be able to' is sometimes preferred to avoid the repetitive use of modal verbs.
Common Mistakes
The most common mistake is adding 'to' after 'can'. Another error is trying to use 'can' in the future tense (e.g., 'I will can'). Always use 'will be able to' for the future.
Memory Tip
Think of 'CAN' as 'Capability And Nature'. If it is in your nature or capability, you CAN do it!
Word Origin
The word comes from the Old English 'cunnan', meaning 'to know' or 'to know how to'. It is related to the word 'cunning' and 'can' (as in a container).
Cultural Context
The word 'can' reflects the English focus on capability and empowerment. It is a cornerstone of the 'can-do' attitude often associated with modern professional culture.
Examples
I can swim across the lake.
everydayCan I use your phone, please?
formalYou can leave whenever you want.
informalHeavy rain can cause flooding.
academicWord Family
Common Collocations
Common Phrases
can't help it
as best as I can
can you believe it
Often Confused With
Could is the past tense of can or a more polite present tense. Use 'can' for current ability and 'could' for past ability or polite requests.
May is more formal than 'can'. Use 'may' when asking for permission in very professional or academic environments.
Grammar Patterns
Remember the base verb rule
Never add 'to' or 's' after 'can'. It is always 'can swim', not 'can to swim' or 'can swims'.
Avoid double modals
You cannot use two modal verbs together. Do not say 'I will can go', instead use 'I will be able to go'.
Politeness variations
While 'Can I...' is common, native speakers often use 'Could I...' or 'May I...' to sound more polite in formal settings.
Test Yourself
Choose the correct form to complete the sentence.
She ___ play the piano very well.
Modal verbs do not change for the third person singular.
Select the sentence that uses 'can' correctly.
Which sentence is grammatically correct?
Modal verbs are followed by the base form of the verb without 'to'.
Rearrange the words to form a question.
you / can / speak / English / ?
In questions, the modal verb 'can' moves to the front of the sentence.
Score: /3
Frequently Asked Questions
4 questionsNo, 'can' is a modal verb and never changes form. You say 'he can' instead of 'he cans'.
You simply add 'not' after 'can' to make it 'cannot' or the common contraction 'can't'. Both are widely accepted in speech and writing.
No, 'can' is for the present. Use 'could' for the past tense or 'was able to' to describe a specific achievement.
It is neutral and used in almost every context. However, 'may' is often preferred in very formal requests or official permissions.
Learn it in Context
This Word in Other Languages
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