Verb: The most common use. It means to throw something forcefully, to put actors into roles, or to form something by pouring liquid into a mold.
* Example: "He cast a fishing line into the water."
* Example: "The director cast a famous actor in the lead role."
* Example: "They cast a statue of bronze."
Noun: It refers to the group of actors in a play, film, or show.
* Example: "The cast of the play was excellent."
* Example: "The entire cast was present at the premiere."
Adjective: This use is less common and usually describes something as having been cast or molded from a liquid.
* Example: "The cast iron pot is very heavy."
* Example: "They used a cast concrete foundation for the building."
To determine the part of speech of "cast," you need to look at the context of the sentence and understand how it's being used.