What is the difference between "before the industrial revolution begin" and "before the industrial revolution begun"?
before the industrial revolution [---], everything was handmade, meaning there were errors.
My thinking for this question was that the before the IR was started there was not IR (what starts, before it starts?) - somehow time travelling or transferring myself to the time before the IR (we do go to different times when writing articles and thereon, making "before the industrial revolution begin" correct.
On the other hand, IR happened in the past (I mean it is history) therefore, It paves the way to say that "before the industrial revolution begun" is correct. (same of saying "before [something that happened in the past]")
I read some sources of IR but nothing of them include the phrase I am saying.
I also considered "had begun". Also what about "would have begun/begin/began?