A Sentence is a group of words with absolute meaning.
Functionally, sentences are 4 types
  1. Declarative Sentence = Statement
  2. Interrogative Sentence = Question
  3. Imperative Sentence = Command
  4. Exclamatory Sentence = Exclamation
Structurally, sentences are 4 types
  1. Simple Sentence
  2. Compound Sentence
  3. Complex Sentence
  4. Complex-Compound Sentence

1. Declarative Sentence (or) Statement
A sentence that declares or asserts a statement is called as Declarative sentence. It ends with a full-stop (.).
Examples:
  • She ate an apple.
  • They are playing.
2. Interrogative Sentence (or) Question
A sentence with a question is called as Interrogative sentence. It ends with a question mark (?).
Examples:
  • What are you doing?
  • How are you?
3. Imperative Sentence (or) Command
A sentence with a request/command/order/advice is called as Imperative sentence. It ends with either a full-stop(.) or an exclamation mark()!..
Examples:
  • Please give me the pen. - request
  • Let's go out. - command
  • Don't worry. - advice
4. Exclamatory Sentence (or) Exclamation
A sentence with the expression of strong emotion is called as Exclamatory sentence. It consists of exclamation mark (!).
Examples:
  • How beautiful the nature is!
  • Alas! I missed the bus!

A clause is a group of words with a subject-verb combination.
A sentence with one clause is independent clause.
A sentence with one clause (independent/main clause) is dependent with other clause is (dependent/subordinate clause).
1. Simple Sentence
A simple sentence consists of only one clause.
Examples:
  • She ate an apple.
  • They are playing.
2. Compound Sentence
A sentence with at least two independent clauses by coordinate conjunctions (but, and, or, nor, yet, so) and without dependent clause. Can also use semicolon (;) to join sentences.
Examples:
  • I bought a fan but it didn't work.
  • She didn't study well for exam. So, she failed.
  • I went to restaurant; I ate pizza.
3. Complex Sentence
A sentence consists of one independent clause and at least one dependent clause by subordinate conjunctions(because, since, although, unless).
Examples:
  • I need an employee who works hard.
  • She went to a movie that is a big hit in recent times.
4. Complex-Compound Sentence
A sentence consists of at least two independent clause and one or more dependent clauses.
Examples:
  • I went to hospital but doctor didn't come which disappointed me.
  • We went for a movie, but got wet because of rain.

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