Neither. IS forms part of a verb.
If is not a preposition. It is a conjunction.
Who is a pronoun or a conjunction for restrictive clauses. It is not a preposition.
"Or" is not a preposition. It's a conjunction.
Of is a preposition.
"for" can function as both a preposition and a conjunction. As a preposition, it shows a relationship between a noun or pronoun and other words in a sentence. As a conjunction, it connects words, phrases, or clauses.
No, it is not a conjunction. Below can be a preposition or an adverb.
No. It is a coordinating conjunction. It can rarely be a noun. It cannot be used as a preposition.
No, "so that" is a compound conjunction. It means "in order that."
No, it is a preposition. It combines the participle adjective according with the preposition to.
Despite is a preposition.
When can you use than as a preposition rather than a conjunction?
No, "because" is a conjunction, not a preposition. It is used to introduce a reason or explanation for something.