1️- Je prends le petit déjeuner avant "de" travailler.
2️- Je dîne après le travail.
➡️ Hello, I'm not sure, but I guess "après" doesn't have any preposition, while "avant" has the preposition "de" and so we say "avant de", but "après". If this is right, why does one say:
3️- Quatorze vient après treize.
4️- Dix-neuf vient avant vingt.
(as you see, "après" still has not any preposition, while "avant" doesn't have the preposition "de" anymore.)
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🔎 I have another question: In the first sentence, there is an infinitive after "de" (which is "travailler"), while in the second one there isn't…