What is a Sentence? A sentence is the major foundation of all essay's. Writer can't express their ideas without the usage of sentences. There are four esstenial purposes of sentences declarative, interrogative, exclamatory,and imperative.(Hacker pg.463) Simple, compound, complex,and compound-complex are all examples of different forms of sentences.(Hacker pg.463)
Purpose:
Declarative sentence: It never gives a command or state a question; it only tells the audience your ideas.
Interrogative sentence: It askes your audience a question relating to your topic.