1) Dialogue precedes monologue in language development, as turn-taking and interaction are among the first communicative skills babies develop through conversations with parents.
2) There are two types of discourse: reciprocal, which allows for interaction/feedback, and non-reciprocal, such as a book. Most discourse involves some level of reciprocity.
3) Monologues are often constructed with an imagined receiver in mind, forming a kind of connection to dialogue. Sentences may be adjusted based on assessing the receiver's response.