A contraction is a shortened version of written and spoken words, created by omission of internal letters. The missing letters are replaced by an apostrophe. is not……….isn’t are not……….aren’t was not……….wasn’t were not……….weren’t have not……….haven’t has not……….hasn’t had not……….hadn’t will not……….won’t would not……….wouldn’t do not……….don’t does not……….doesn’t did not……….didn’t cannot……….can’t could not……….couldn’t should not……….shouldn’t might