* can't (cannot)
* won't (will not)
* isn't (is not)
* aren't (are not)
* wasn't (was not)
* weren't (were not)
* haven't (have not)
* hasn't (has not)
* hadn't (had not)
* don't (do not)
* doesn't (does not)
* didn't (did not)
* shouldn't (should not)
* wouldn't (would not)
* couldn't (could not)
* mustn't (must not)
These contractions are commonly used in informal writing and spoken English to simplify and shorten phrases.