+T+.--These classes have been made with regard to the _form_ of the
sentence. We will now arrange sentences in classes with regard to their
_meaning_.

_Mary sings. Does Mary sing? Sing, Mary. How Mary sings!_ Here are four
simple sentences. Do they all _mean_ the same thing?

+P+.--They do not.

+T+.--Well, you see they differ. Let me tell you wherein. The first one
tells a fact, the second asks a question, the third expresses a command,
and the fourth expresses sudden thought or strong feeling. We call the
first a +Declarative sentence+, the second an +Interrogative sentence+, the
third an +Imperative sentence+, and the fourth an +Exclamatory sentence+.


+DEFINITION.--A _Declarative Sentence_ is one that is used to affirm or to
deny+.

+DEFINITION.--An _Interrogative Sentence_ is one that expresses a
question+.

+DEFINITION.--An _Imperative Sentence_ is one that expresses a command or
an entreaty+.

+DEFINITION.--An _Exclamatory Sentence_ is one that expresses sudden
thought or strong feeling+.

+INTERROGATION POINT--RULE.--Every direct interrogative sentence should be