Can’t is the short form of cannot. You use it to say something is impossible, not allowed, or beyond your ability. It belongs to a family of English contractions, including I’d, I’ll and won’t, that fold two words into one with an apostrophe.
What can’t means
Can’t has three main jobs:
- Ability: “I can’t swim.”
- Permission: “You can’t park here after 6 p.m.”
- Certainty that something is false: “That can’t be right. I paid the bill yesterday.”
The third use surprises learners. “She can’t be home yet” doesn’t mean she is forbidden to be home. It means you’re sure she isn’t.
Can’t, cannot or can not?
| Form | Register | Example |
|---|---|---|
| can’t | Everyday speech, casual writing | I can’t come tonight, sorry. |
| cannot | Formal writing, emphasis | Applicants cannot reapply within 12 months. |
| can not | Only when not goes with the next word | You can not reply if you’d rather keep quiet. |
In most sentences, cannot is written as one word. Two words only make sense when not belongs to the following phrase, as in “you have the option of not replying.”
How n’t contractions work
The ending n’t attaches only to auxiliary and modal verbs. That’s why “good n’t” isn’t real English. Good is an adjective, so it can’t take n’t. You’ll see “goodn’t” online, sometimes as a joke and sometimes as internet slang meaning “bad” or “not good,” but it isn’t standard English.
A few forms change spelling when they contract. Will not becomes won’t, and shall not becomes shan’t. Cannot drops one n to become can’t.
| Full form | Contraction | Note |
|---|---|---|
| cannot | can’t | Most common |
| will not | won’t | Irregular spelling |
| do not | don’t | Plural noun: dos and don’ts |
| should not | shouldn’t | Regular |
| must not | mustn’t | Silent first t |
I’d, I’ll and other pronoun contractions
I’ll means I will (and sometimes I shall). I’d takes more work, because it can stand for two phrases. Look at the next word to tell them apart.
| Contraction | Stands for | Quick test |
|---|---|---|
| I’ll | I will | “I’ll call you.” |
| I’d + base verb | I would | “I’d love to.” |
| I’d + past participle | I had | “I’d already left.” |
| I’d better | I had better | Fixed phrase |
What about me’s? It isn’t a standard contraction. You’ll only hear it in some regional dialects. In standard English, the possessive is my: “my bag,” never “me’s bag.”
Why people search “can t” and “i ll”
Phones and search boxes often drop the apostrophe. That’s how “can t” and “i ll” end up in searches. In your own writing, keep the apostrophe. Ill without it is a different word that means sick.
Usage tip
In American speech, the t in can’t is often barely heard. Listeners rely on the vowel and stress instead. Can is usually weak (“I c’n go”), while can’t is stressed (“I CAN’T go”). Listen to audio examples and practice the contrast aloud.
Often confused with
Cant (no apostrophe) is a real noun. It means hypocritical, pious talk or the private jargon of a group.
Translations of can’t
| English | Translation | Note |
|---|---|---|
| I can’t | Spanish: no puedo | Same in formal and informal |
| You can’t | Spanish: no puedes / no puede | Informal tú / formal usted |
| I can’t | French: je ne peux pas | Spoken: je peux pas |
| You can’t | French: tu ne peux pas / vous ne pouvez pas | Informal / formal |
| I can’t | German: ich kann nicht | No contraction |
| I can’t | Italian: non posso |
FAQ
Is can’t too informal for essays?
In most academic and legal writing, yes. Use cannot there. In emails, articles and dialogue, can’t reads naturally.
What are good synonyms for can’t?
Cannot, am unable to, it’s impossible to and am not allowed to all work. Choose the one that fits your meaning.
How do you make a question tag with can’t?
Pair a positive statement with a negative tag: “You can drive, can’t you?”
About this article
- Fact-checked by Maureen Talbot against the sources listed below before publication.
- Published
Sources (1)
- Contraction (grammar) (en.wikipedia.org)