An interrogative sentence is one that asks a questions. The easiest way to identify them is because they usually end with a question mark ("?"). Declarative sentences are those that provide a description, a piece of information or a fact, and this is the most common type of sentence that there is. An imperative sentence is one that gives a command, while an exclamatory sentence is one that uses an excited tone and usually ends with an exclamation mark ("!").
