2) VERBAL EXPRESSION (b)

Monologue - an extended speech by one person. It can be heard by other characters, who are on the stage.

Soliloquy - a type of monologue in which a character directly addresses the audience while alone on the stage (or while the other actors keep silent); it's not meant to be heard by the other characters.

Both monologue and soliloquy are used to show a character's inner thoughts and feelings.

Aside - when a character makes a short, revealing comment to the audience and his/her words are not meant to be heard by the other actors.