+19.+ We have found that we use sentences to express our thoughts. But
we also find that we use these sentences in different ways for different
purposes. Can you notice any difference in the following sentences?
Two classes have always existed.
To which class do you belong?
Join your class in the struggle.
When I say, _Two classes have always existed_, I am making a simple
assertion, stating what I know or believe to be true.
When I say, _To which class do you belong?_ I am asking a question.
When I say, _Join your class in the struggle_, I am giving a command or
making a request.
+20.+ +These three kinds of sentences are called assertive,
interrogative and imperative.+
+An assertive sentence states a fact or an opinion.+
+An interrogative sentence asks a question.+
+An imperative sentence gives a command, makes a request or
expresses a wish.+
+21.+ Any of these three kinds of sentences may be exclamatory; that is,
it may express surprise, excitement, impatience, or some other emotion.
For example:
Hurrah! Freedom is coming!
This is an assertion expressed as an exclamation.
Oh! Why should war continue?
Here we have a question in the form of an exclamation.
Come! Keep your courage up.
In this, we have a command, an imperative sentence, expressed in the
form of an exclamation.
+An exclamatory sentence expresses surprise, excitement or some other
emotion.+
In these three forms of sentences, the assertive, the interrogative and
the imperative, together with the exclamatory, we are able to express
every thought and feeling which demands expression, either for practical
or artistic purposes.
The sentence is the basis of spoken and written language and as we trace
its development we trace the history of the evolution of man and the
growth of his power of expression, as he has developed his powers of
mind.
+22.+ +Every sentence must begin with a capital letter.+
+Every assertive and imperative sentence should end with a period.+
+Every interrogative sentence should end with a question mark.+
The word in an exclamatory sentence which expresses strong emotion is
followed by an exclamation point. The sentence itself if in
interrogative form should be followed by a question mark; if in the
assertive or the imperative form it may be followed either by an
exclamation point or a period.