What is what part of speech is after?

After can be used as a preposition, an adverb, or a conjunction, depending on its context in a sentence.

1. Preposition: After is used as a preposition when it is followed by a noun or pronoun to indicate the time, place, or sequence of an event. For example, "We went for a walk after dinner."

2. Adverb: After can also function as an adverb when it modifies a verb, adjective, or other adverb. For example, "She felt better after taking some medicine."

3. Conjunction: After can act as a conjunction when it connects two clauses or phrases in a sentence. For example, "We can go to the park after we finish our homework."