The verb "enter" does not normally require a preposition, although it can use into which changes the meaning:
To enter into an agreement -- make an agreement
The preposition with and to can be used
"He entered the room with some hesitation."
"Women must enter to the left."
There is also a common colloquial expression: Enter atyour own risk.
It is almost always used as a preposition.
No the word every is not a preposition.
The word "versus" is a preposition because it shows the relationship between two nouns. Its meaning is "against," which is also used as a preposition.
Yes, the word among is a preposition.
The word toward is a preposition. It means moving in the direction of something. (e.g. toward the window)
No, the word "when" is not a preposition. It is an adverb or a conjunction used to indicate time or a condition.
No, the word "because" cannot be used as a preposition. It is a subordinating conjunction used to introduce a reason or cause.
No, the word "if" is not a preposition. It is a conjunction that is used to introduce a conditional clause.
The word "when" is not typically used as a preposition. It is most commonly used as an adverb to ask or express the time of an action or event.
No, the word "stop" is not a preposition. It is a verb that indicates an action of coming to a halt or ceasing movement.
It is almost always used as a preposition.
No, "but" is typically used as a conjunction to contrast two ideas or clauses. It is not commonly used as a preposition in English grammar.
No, "until" is a subordinating conjunction used to connect two events in time.
No, "few" is not a preposition. It is an adjective used to describe a small number or amount of something.
Yes, it is a preposition. It can also be used as a conjunction.
No, the word "forget" is not a preposition. It is a verb used to describe the action of not remembering something.
The word "for" is used as a preposition. It is used to indicate the purpose or reason for an action or the intended recipient of something.