HomeGrammarUses of Must and Can’tUses of Must and Can’t admin 3 August 2015 Grammar No Comments Uses of Must and Can’t;You can use must to say that you believe something is certain.You can use can’t to say that you believe something is not possible. Tweet Pin It Related Posts Active – Passive Overview Differences and Using All and Whole What Are Prefixes – English GrammarAbout The Author admin