Learn Deduction (Must / Can't / Might): a clear explanation, examples and free practice adapted to your level.
Explanation
Use "must" for a logical conclusion (almost certainly true), "can't" for something almost certainly false, and "might/may/could" for something possible but uncertain.
He's not answering — he must be asleep. That can't be true! She might be busy.
Example
You've been traveling all day — you must be exhausted.
