Conventionally because is considered a conjunction, because it links (or conjoins) two clauses. The argument against its classification as a conjunction is that because operate like other subordinating or coordinating conjunctions but does operate like prepositions.
This post on the Language Log demonstrates that because is not a conjunction by comparing it to that (subordinating conjunction) and and (coordinating conjunction). I summarize the argument below.
Typical subordinating conjunction: that
- That can be omitted from a sentence and the sentence's meaning generally remains the same.
- The clauses cannot be rearranged and maintain meaning: "[clause 1] that [clause 2]" != "that [clause 2], [clause 1]".
- Complements follow that.
- If because is omitted from a sentence the meaning does not remain the same.
- With because the clauses can be rearranged.
- Adjuncts generally follow because.
Typical coordinating conjunction: and
- The two clauses joined by and can be rearranged and the meaning stays the same.
- And cannot start a sentence.
- Rearranging the clauses changes the meaning with because.
- Because can start a sentence.
Because does not act like conjunctions, and thus is not a conjunction. It does, however, act like prepositions.
Prepositions can introduce noun-phrases, clauses, preposition phrases, and nothing, depending on the preposition. Because has long introduced clauses and preposition phrases (with of) and more recently also introduces noun-phrases.
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