1. Preposition: This is the most common use of "for." It shows a relationship between a noun or pronoun and another word in the sentence.
* Examples: "I bought a gift for my friend." "We waited for hours."
2. Conjunction: This is less common, but "for" can also connect two clauses.
* Example: "I was late for the train was delayed." (This is less common, "because" would be more typical)
3. Interjection: "For!" can be used to express surprise, excitement, or agreement.
* Example: "For! I can't believe you won!"
To determine the part of speech for "for" in a specific sentence, look at its function and how it relates to the other words.