1. I always have the radio on while doing the housework. (while is a conjunction)
2. On hearing the news, they left at once. (on is a preposition)
3. After working all evening, John felt tired.
In #3, is the word "after" a conjunction or a preposition?
In modern grammar, "while" and "after" are both prepositions. org/wiki/after
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In modern grammar, "while" and "after" are both prepositions.