All written or spoken language arranges itself into sentences which are described as assemblages of words which make complete sense ; as, " God is love."
Every sentence consists of two parts, subject and predicate.
The Subject is that respecting which something is affirmed. In the above example, God is the subject.
The Predicate is that which is affirmed respecting the subject. In the above example, the words is love constitute the predicate.
As regards their signification, sentences are divided into four classes ; viz., Declarative, Interrogative, Imperative, and Exclamatory.
A Declarative Sentence is one that declares something. The sun shines.
Declarative sentences constitute the greater part of written language.
An Interrogative sentence is one that asks a question, and is generally introduced by an interrogative pronouo, who, which, or what; or, by an auxiliary, do, am, have, shall, may, etc.
An Imperative sentence is one that expresses a command, an exhortation, an entreaty, or permission, and is generally introduced by a verb in the imperative mood, let being often used for that purpose; as, "Go in peace;" "Let him arise." The subject of an imperative sentence is often understood.
An Exclamatory Sentence is one that exclaims something; as " How it snows!"
As regards their construction, sentences are divided into three classes, Simple, Compound and Complex. Simple sentence are such as make complete sense when used alone.
Compound Sentences are such as have two or more simple sentences.
Complex Sentences are such as have a principal or independent sentence modified by one or more subordinate clauses or sentences.