1.Explanation
Objective:Inform
Purpose:To describe a process, phenomenon逮壁，or situation; to outline reasons, causes, effects, similarities, and differences.
Features:Contains factual statements relevant to a given topic with limited evaluation.
2.Argument
Objective:Persuade
Purpose:To forward a well-informed and convincing point of view; to take a position and discredit alternatives
Features:Contains a clear thesis statement, relevant supporting evidence.and decisive conclusion
3.Discussion
Objective:Evaluate
Purpose:To outline and evaluate alternative sides of a controversial issue or argument; to arrive at a well-balanced conclusion
Features:Contains a well balance evaluation, relevant supporting evidence, and a tentative conclusion
