By looking at it.
he is and they are
Heathcliff is the morose and vengful protagonist in Emily Bronte's novel Wuthering Heights. It is not fair to call him a morose person just because he was depressed when you met him. (Adj.) having...
Sam sat alone, looking morose
Turn the light on. Why is the fan on? Come on the train. These are all examples of how to use on... the correct way. hehe