In thinking we arrange and associate ideas and objects together. Words are the symbols of ideas or objects. A SENTENCE is a group of words that expresses a single complete thought.
SENTENCES are of four kinds:
1. DECLARATIVE - a sentence that tells or declares something. Ex: That book is mine.
2. IMPERATIVE - a sentence that expresses a command. Ex: Bring me that book.
3. INTERROGATIVE - a sentence that asks a question. Ex: Is that book mine?
4. EXCLAMATORY - a declarative, imperative, or interrogative sentence that expresses violent emotion, such as terror, surprise, or anger. Ex: You shall take that book! Can that book be mine?