Humans have the ability to speak. This ability to speak helps us express and convey all our thoughts and feelings to others. When we speak, we use words. Words are put together to form a sentence. The words are placed in an order so that the sentence becomes comprehensible. There are different types of sentences that help us convey our feelings through them. These are very important from the writer's point of view. A writer can use only sentences to explain the different emotions in his/her write-up. There is no room for voice modulation that will help express these emotions. Use of different sentences helps in adding some interest and creativity in the articles or write-ups. Now, let us understand what are simple, complex, and compound sentences, which are used to frame words according to the basic rules of English grammar. You can understand sentences better by going through the different parts of speech. A sentence that contains a subject and a verb to express the complete thought or emotion is called a simple sentence. A simple sentence is also called an independent clause. For Example Ann likes to dance. Betty goes to the church. As you can see from the above examples of simple sentences, a subject and a verb help express the idea behind the thought. The second example also proves that a simple sentence can contain a compound verb or subject/s as well. A sentence that contains two independent clauses that are connected with the help of a coordinator is called a compound sentence. The coordinators help build a relationship between the two clauses. The coordinators used to connect independent clauses are: and, but, for, nor, or, so, yet. In most cases, a comma precedes a coordinator. However, in very short sentences, the commas can be exempted according to the rules of English grammar. For Example Ann wanted to study, so Tom went fishing alone. Ann wanted to sleep, for Tom went bowling. As you can see, the independent clauses are connected with a coordinator. In both cases, the relationship between the independent clauses changes with the use of a different coordinator. You can play around with the coordinators and use them to express the basic idea. When an independent clause is connected with one or more dependent clauses, it is called a complex sentence. Complex sentences are connected using subordinators. These subordinators include: although, after, since, because, when. When the sentence contains a relative pronoun, the subordinators used include: that, which, who. Commas are to be added after the dependent clause in cases when the complex sentence begins with a subordinator. You do not add a comma in sentences where an independent clause begins with a subordinator in the middle of a sentence. For Example The model returned the clothes after she finished with the ramp walk. When Ann woke up in the morning, she forgot to call her friend for notes. As you can see in the above sentences, the first complex sentence example does not require a comma before the subordinator. Whereas, the second example needs a comma as the sentence begins with a subordinator. We have now learned the different formations of sentences. We shall now understand the different sentences used to express various thoughts. There are 4 types used in the grammar and composition, which have been elaborated in the passages below: A declarative sentence is also called a statement or assertive sentence. This sentence ends with a period or full stop. These sentences are either simple, compound, or complex sentences. They are mostly short and to the point. A declarative sentence is a statement that states an idea. They are mostly stating facts. In some cases, it may contain prepositions, objects of prepositions, and direct and indirect objects. For Example

• I want tea.
• The house was built by my grandfather.
• Sara is late for work.
• The movie, though funny, had some amount of dark humor that may not be appreciated by all.

An interrogative sentence is the one that asks a question. These sentences end with a question mark (?). They generally begin with who, what, how, why, where, did, do, or is. For Example

• Pussy cat, pussy cat, where have you been?
• Have you seen Roger?
• Will you pass me the sauce?
• What time is the train?

An imperative sentence is usually a command or order, wherein you ask someone to do something. These sentences generally end with a period like declarative sentences. They usually tend to lack a specific subject. The subject is usually an implied subject that is commanded or requested to do some task. These sentences can also be short, simple or complex sentences. For Example

• Come here.
• Shut the door.
• Stop laughing.
• Clean your desk.

An exclamatory sentence helps convey strong feelings and emotions. These feelings include happiness, anger, excitement, surprise, etc. The emotions in the sentence are read out loud due to the presence of the exclamation mark in the end. Of course, the sentence should contain strong emotion(s), because an exclamation mark itself will not be able to convey the feelings. If the emotions are expressed, then it can be called an exclamatory sentence. For Example

• Oh my God!
• Run, it's a monster!
• Help! Help!
• I don't believe this!

When you try to identify a specific type of sentence, you should ask yourself the question, what is the sentence doing? Correct grammar usage will help you form correct sentences. This will help you differentiate between each type of sentence, which will prove to helpful for your exams, interviews, speech, quiz, games, etc. All the very best!