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Adventurer
Here's the thing. Harvard wouldn't make a mistake like that and say, "IF you take the Law course at Harvard, you may take a room in the Law dormitory." What Harvard(other colleges) would say is, "IF you enrolled in a Law course at Harvard, you may take a room in the Law dormitory." Enrollment is the trigger, not taking. You are not by any stretch of the imagination "taking" the class until it begins. And you certainly didn't take the class before it ended. Prior to the class beginning you were "going to take it," during the class you were, "taking it," and after the class you have "taken it" or "did you take it? Yes."
No.
I should expand that a bit: sure, 'going to take' indicates a future intention, 'taking a course' indicates the present tense of you are currently within the time period of the start and end of the course, and 'taken the course' indicates that the course has finished.
My 'no' is simply that none of those are the words used by the feat! I'm sure we wish the feat was so clearly written!
The feat uses the word 'take'. "If you take".
To be the past tense, the phrase would be, "If you have taken".
"It rains" = "it is raining", not "it will rain".
"You take" = "you are taking", not "you will have taken".
"If you take", is conditional on a future action. It =/= "if you have taken".