English Language Guide: Conjunction

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Conjunctions express a variety of logical relations between phrases, clauses and sentences." There are two kinds of conjunctions: coordinating conjunctions and subordinating conjunctions.
Coordinating conjunctions link "elements of equal grammatical status." The elements in questions may vary from a prefix to an entire sentence.
Examples:A correlative conjunction is a pair of constituent elements, each of which is associated with the grammatical unit to be coordinated. The common correlatives in English are:
Subordinating conjunctions
Subordinating conjunction relate only clauses to one another. They make the clause associated with them into a subordinate clause. Some common subordinating conjunctions in English are: (of time) after, before, since, until, when, while; (cause and effect): because, since, now that, as, in order that, so; (opposition): although, though, even though, whereas, while; (condition): if, unless, only if, whether or not, whether or no, even if, in case (that), and so forth.