Actually, "in the event" is an entire prepositional phrase. In is the preposition and event is the object (a noun).
"Until" is a conjunction, not a preposition. It is used to indicate when a specific event or action will happen or the time leading up to that event.
No, it is not a preposition. Again is an adverb.
No, the word "early" is an adverb, not a preposition. It is used to describe the timing of an action or event.
"Always" is not a preposition; it is an adverb, which typically describes the frequency of an action or event.
No, "afterward" is an adverb, not a preposition. It is used to indicate time in relation to a past event.
No, it is not a preposition. The word afterwards is an adverb.
No. The word "anything" is an indefinite pronoun.
The preposition "IN" means within, inside, part of a process, or at a location. It can also be used idiomatically with other terms (e.g. in the event, in order to, in which).
The word "a" is never used as a preposition. It may be used as part of a prepositional phrase. However, the word "at" is a preposition, indicating location or time.
Yes, it is a preposition. It can also be used as a conjunction.
Yes, during is a preposition. It forms adverb phrases of time.
"Until" can function as both a preposition and a conjunction. As a preposition, it is used to specify a point in time or an event. As a conjunction, it is used to introduce a clause indicating the time when something will happen.