In grammar, a conjunction is a part of speech that connects words, phrases, or clauses that are called the conjuncts of the conjunctions. The term discourse marker is mostly used for conjunctions joining sentences. This definition may overlap with that of other parts of speech, so what constitutes a "conjunction" must be defined for each language. In English a given word may have several senses, being either a preposition or a conjunction depending on the syntax of the sentence. For example, "after" is a preposition in "he left after the fight", but it is a conjunction in "he left after they fought". In general, a conjunction is an invariable grammatical particle and it may or may not stand between the items conjoined. The definition of a conjunction may also be extended to idiomatic phrases that behave as a unit with the same function, "as well as", "provided that". A simple literary example of a conjunction: "the truth of nature, and the power of giving interest". A conjunction may be placed at the beginning of a sentence: "But some superstition about the practice persists."
Coordinating conjunctions
Coordinating conjunctions, also called coordinators, are conjunctions that join, or coordinate, two or more items of equal syntactic importance. In English, the mnemonic acronym FANBOYS can be used to remember the coordinators for, and, nor, but, or, yet, and so. These are not the only coordinating conjunctions; various others are used, including "and nor", "but nor", "or nor", "neither", "no more", and "only". Types of coordinating conjunctions include cumulative conjunctions, adversative conjunctions, alternative conjunctions, and illative conjunctions. Here are some examples of coordinating conjunctions in English and what they do:
Only and, or, nor are actual coordinating logical operators connecting atomic propositions or syntactic multiple units of the same type within a sentence. The cause and consequence conjunctions are pseudocoordinators, being expressible as antecedent or consequent to logical implications or grammatically as subordinate conditional clauses.
Correlative conjunctions
conjunctions work in pairs to join words and groups of words of equal weight in a sentence. There are many different pairs of correlative conjunctions:
either...or
not only...but
neither...nor
both...and
whether...or
just as...so
the...the
as...as
as much...as
no sooner...than
rather...than
not...but rather
Examples:
You either do your work or prepare for a trip to the office.
Both the cross country team and the swimming team are doing well.
You must decide whether you stay or you go.
Just as many Americans love basketball, so many Canadians love ice hockey.
The more you practice dribbling, the better you will be at it.
Football is as fast as hockey.
Football is as much an addiction as it is a sport.
No sooner did she learn to ski than the snow began to thaw.
I would rather swim than surf.
Conjunctions of time
Examples:
Subordinating conjunctions
Subordinating conjunctions, also called subordinators, are conjunctions that join an independent clause and a dependent clause, and also introduce adverb clauses. The most common subordinating conjunctions in the English language include after, although, as, as far as, as if, as long as, as soon as, as though, because, before, even if, even though, every time, if, in order that, since, so, so that, than, that, though, unless, until, when, whenever, where, whereas, wherever, and while. Complementizers can be considered to be special subordinating conjunctions that introduce complement clauses: e.g. "I wonder whether he'll be late. I hope that he'll be on time". Some subordinating conjunctions, when used to introduce a phrase instead of a full clause, become prepositions with identical meanings. The subordinating conjunction performs two important functions within a sentence: illustrating the importance of the independent clause and providing a transition between two ideas in the same sentence by indicating a time, place, or cause and therefore affecting the relationship between the clauses. In many verb-final languages, subordinate clauses must precede the main clause on which they depend. The equivalents to the subordinating conjunctions of non-verb-final languages such as English are either
clause-final conjunctions ; or
suffixes attached to the verb, and not separate words
Such languages often lack conjunctions as a part of speech, because:
the form of the verb used is formally nominalised and cannot occur in an independent clause
the clause-final conjunction or suffix attached to the verb is a marker of case and is also used in nouns to indicate certain functions. In this sense, the subordinate clauses of these languages have much in common with postpositional phrases.
In other West Germanic languages like German and Dutch, the word order after a subordinating conjunction is different from that in an independent clause, e.g. in Dutch want is coordinating, but omdat is subordinating. The clause after the coordinating conjunction has normal word order, but the clause after the subordinating conjunction has verb-final word order. Compare: Similarly, in German, "denn" is coordinating, but "weil" is subordinating:
Starting a sentence
It is now generally agreed that a sentence may begin with a coordinating conjunction like and, but, or yet. But there has been a mistaken belief in some sort of prohibition, or what Follett's Modern American Usage called a "supposed rule without foundation" and a "prejudice lingers from a bygone time" that English sentences should not start with conjunctions. People associate this mistaken belief with their early school days. One conjecture is that it results from young children being taught to avoid simple sentences starting with and and encouraged to use more complex structures with subordinating conjunctions. In the words of Bryan A. Garner, the "widespread belief... that it is an error to begin a sentence with a conjunction such as and, but, or so has no historical or grammatical foundation", and good writers have frequently started sentences with conjunctions. There is also a "myth" that a sentence should never begin with because. Because is a subordinating conjunction and introduces a dependent clause. It may start a sentence when the main clause follows the dependent clause.
Examples
"And now we have Facebook and Twitter and Wordpress and Tumblr and all those other platforms that take our daily doings and transform them into media."
"So any modern editor who is not paranoid is a fool".
"And strikes are protected globally, existing in many of the countries with labour laws outside the Wagner Act model."
In Warlpiri, a Pama-Nyungan language spoken in Australia, conjunctions function differently from English or other Germanic languages. In unembedded contexts, Warlpiri uses the coordinator manu, such that P manu Q translates to "P and Q": Cecilia manu Gloriapala yanu tawunu kurra means "Cecilia and Gloria went to town", but in the negative contexts, P manu Q translates to "neither P nor Q", such that kularnangku yinyi rampaku manu loli means "I won't give you cookies or lollipops", as kularnanagku is a form of the Warlpiri negative marker.
