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There are four types of sentences;

1. Declarative sentence: The sentence that makes a proper statement is known as a declarative sentence. It has further two types positive and negative.
For example; I will go to the party (positive) I will not go to the party (negative)

2. Interrogative sentence: The sentence that makes a question is known as interrogative sentence.
For example; Where is your book?

3. Imperative sentence: The sentence that makes any request.
For example; Please open the door.

4. Exclamatory sentence: The sentence that expresses some feelings is known as exclamatory sentence.
For example; Hurrah! We are going to the beach.