Compound and complex sentences

English language has four types of sentence structures, including simple, complex, compound, and mixed sentences. Among these, simple sentence is basic form of sentence; whereas, complex sentence is formed with the help of two clauses — main clause and dependent clause. Apart from this, compound sentence includes only independent clauses; but, mixed sentence is mixture of both complex and compound. Here, you will learn about compound and complex sentences.

Sentence meaning and definition

It is a orderly group of words, including subject and predicate, with clear sense of meaning. In short, for complete meaning, sentence doesn’t need any optional things. But, the structure of sentences may vary according to demand of expression.

Four types of sentence structures

•Simple sentence — subject + predicate

•Complex sentence — main clause + subordinating clause.

•Compound sentence — two independent clauses

•Mixed sentence — it includes two or more than two independent and dependent clauses.

Rules of formation of complex sentence

•There should be separate subject and predicate for each clause.

•The subordinate clause should depend on the main clause.

•Both main and subordinate clauses shouldn’t be equal importance.

•Subordinating conjunctions should be used to form complex sentences.

•Punctuation marks are applicable when the dependent clause is used to begin the sentence.

Examples of complex sentences

Complex sentences are formed with noun, adjective, and adverb clauses along main clause.

Complex sentence with noun clause

Noun clause is also known as subordinating clause, and used to form complex sentences.

•I do not know how he solved the problem. (main clause +noun clause)

•She announces that she is not going to support our proposal.

•I thought that he might help us.

•Can you tell me when the delayed train will arrive ?

Complex sentence with adjective clause

This is the place where I learned to drive.(main clause + adjective clause)

•I think it was Sunday, when we went for picnic.

•August 15th is the day when India got freedom.

•June, when monsoon arrives, is the best month to swim.

•Antarctica where temperature is too low is the best place for polar bear.

Complex sentences with adverb clause

There are various types of adverb clauses, such as, adverb clause of time, reason, cause, etc. Here, I’m going to use adverb clause of time.

As soon as we reach at the reservation centre, we will let you know about status.(Adverb clause of time + main clause)

•We will let you know the status as soon as we reach at the reservation centre.

•As soon as it rains, children start enjoying.(for present sense)

•As soon as they win a game, they start dancing.

•As soon as they have realized, they expressed regret.

Rules of formation of compound sentences

•There should be separate subject and verb for each clause.

•The two clauses shouldn’t depend on each other.

•Both clauses should be equal importance and closely related to each other.

•Coordinating conjunctions are used to form compound sentence.

•Commas or semicolon is placed before joining coordinating conjunction.

Examples of compound sentences

•The winning team invited at the stage. Spectators welcomed them cheerfully.

•The winning team invited at the stage, and spectators welcomed them cheerfully.

•I like to eat simple veg. My brother is fond of spicy chicken.

•I like to eat simple veg; whereas, my brother is fond of spicy chicken.

•He is religious. He is emotional.

•He is both religious and emotional.

•India is culturally diverse country. India is a secular nation.

•Not only is India culturally diverse country, but it also a secular nation.

•He is a talented student. He is a gifted student.

•He is either a talented or gifted student.

•He is neither a talented nor gifted student.

These are some important examples of compound sentences formed with coordinating clauses with main clause.

Correct use of “Although” conjunction

Difference between adverb of degree and manner

Sentence formation processes

How to form compound sentence