Declarative: <em>Makes a statement, using a period. </em>Interrogative: <em>Asks a question, using a question mark. (?) </em>Imperative: <em>Makes a demand, using a period.</em>
There is also a fourth type of sentece: <em />Exclamatory: <em>Expresses strong feeling, using an exclamation point. </em>However, exclamatory sentences are always one of the above as well.