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I’ve known Theo _______ 5 years.  Is it for or since? Easy:

for-since

  • I’ve known him for a long time, it seems.
  • I’ve known him since he showed me his collection of old records and we discovered that we share a hobby.
  • Incorrect: I know him for a long time -> I’ve known him for a long time.

Compare my chart for “until/ by”. I developed these charts a few years ago and get a lot of mileage out of them.