Difference between "before the industrial revolution begin" and "before the industrial revolution begun"

Question

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?

Answer 1

Both are wrong. It's a matter of tense.

• You can't use 'begin' as that is the infinitive form of the verb and you are talking about the past.

• 'Began' is the simple past participle of the verb to begin. It does not need an auxiliary verb.

• 'Begun' is the past participle of the same verb but requires the auxiliary verb.

So, you could say either:

Before the industrial revolution began...

or

Before the industrial revolution had begun...

and of course, you could also convey the same meaning using a noun instead of the verb at all:

Before the beginning of the industrial revolution...