en_tn/act/20/31.md

Paul continues to speak.

be on guard.

"be awake and alert" or "watch out." (UDB) or "stay alert,"

Remember

"Continue to remember" or "Do not forget."

be on guard. Remember

These can be translated as 1) "be on guard and remember" or 2) "be on guard as you remember" or 3) "be on guard by remembering"

for three years I did not stop instructing

Paul did not teach them continuously for three years, but over the space of three years. (See: rc://en/ta/man/translate/figs-hyperbole)

I did not stop instructing

Possible meanings 1) "I did not stop warning" or 2) "I did not stop encouraging with corrections."