what is the difference of in advance, ahead of time, beforehand
some more examples would be appreciate

Question

Answer

Examples: 1.Before I go on a holiday, I usually book my accomodation in advance.
2. I try to get to the air port well ahead of time,  so  that I don't miss my flight.
3.  I check all my luggage beforehand and tie a bright ribbon on the suitcase.

Answer

Basically the same meaning.  However, you would only say, "Thanks in advance"--you wouldn't say "Thanks beforehand" or "Thanks ahead of time."

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