Both may be prepositions, though "for" is practically always a preposition. The word but is almost always a conjunction, more rarely a preposition (no one but me), an adverb, or a noun.
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.
No, the word "when" is not a preposition. It is an adverb or a conjunction used to indicate time or a condition.
Yes. Because can be used as a preposition.
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.
Cannot be used as a preposition, but can be used as a verb or interjection
Yes. Because can be used as a preposition.
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.
Cannot be used as a preposition, but can be used as a verb or interjection
It is almost always used as a preposition.
Yes, "at" can function as a preposition in a sentence, typically indicating a specific location or point in time.
The word "began" is a verb. It is the past tense form of the verb "begin," which means to start or initiate something.
No, it is not a preposition. It is a pronoun also used as an adjective.
Yes, it is a preposition. It can also be used as a conjunction.
Yes, it is a preposition. It can also be used as a conjunction.
The preposition "in" is typically used after the word "competency." For example, one might say "She demonstrated competency in project management."
No, the word "except" is not a preposition. It is typically used as a conjunction or a verb.