The word conjunction comes from Latin roots meaning "join with." In grammar, a conjunction is a joining word.
There are three main types of conjunctions in English: coordinating, correlative and subordinating. This article will focus on coordinating conjunctions.
A coordinating conjunction is a joining word that connects things of equal value. It may join two or more nouns, verbs, adjectives, adverbs, phrases or clauses.
The word fanboys is a memory tool that makes it easy to remember the seven coordinating conjunctions in English. This word is an acronym formed from the first letters of the seven conjunctions: for, and, nor, but, or, yet, so.
Note: The words but and for can also be used as prepositions. In that case, they will take an object (usually a noun or pronoun). The preposition and its object form a prepositional phrase.
And, but and or are the three most commonly used coordinating conjunctions. They can be used to join almost any two or more words or word groups.
Note: When you use a coordinating conjunction between two independent clauses (sentences), you must put a comma before it, as in the last example above.
Yet can be used in the same ways as but to join two contrasting ideas; however, yet gives more emphasis to the contrast.
Nor means "and not"; it is used mainly to join independent clauses, but it requires a change in word order: part of the verb (or sometimes the entire verb) comes before the subject.
For has a meaning similar to because—it indicates that the second idea is the cause of the first one:
So has a meaning similar to therefore—it indicates that the second idea is the result of the first one:
To find out more about conjunctions, read the articles on correlative and subordinating conjunctions.