* Noun: When it refers to the dark area produced by an object blocking light.
* *The tree cast a long shadow across the lawn.*
* Verb: When it means to follow closely or to haunt.
* *The detective shadowed the suspect for days.*
* Adjective: When it describes something that resembles a shadow, usually in color or darkness.
* *She wore a shadow of a smile.*
It's important to consider the context to determine the correct part of speech.