تو باید به اینکه تبار تو نامعلوم است پی ببری.

From Lesson 264:Noun clauses (in ke)·Farsi

Questions & Answers about تو باید به اینکه تبار تو نامعلوم است پی ببری.

Why is there a be right before in ke?
The compound verb for 'to realize' or 'to find out' is pey bordan, which requires the preposition be. Because you are realizing an entire fact ('that your lineage is unknown'), you use in ke (the fact that) to act as a noun placeholder. The preposition be must attach to this placeholder, creating be in ke.
Normally, a long clause with in ke goes at the end of the sentence. Why is it in the middle here?
While long in ke clauses often get pushed to the end of a Farsi sentence, here it acts as the object of the preposition be before the final verb. Farsi grammar allows you to bracket the clause inside the main sentence structure: be in ke + [the clause] + [the conjugated verb pey bebari].
Why is the final verb pey bebari and not pey mibari?
The word bāyad (must) early in the sentence requires the main action to be in the subjunctive mood. For the compound verb pey bordan, you conjugate the bordan part into the present subjunctive for 'you' (singular), giving us bebari.
What is the literal translation of the compound verb pey bordan?
The word pey means a footstep, track, or trail, and bordan means to take or carry. So pey bordan be literally means 'to carry the trail to' something, which is used idiomatically to mean discovering, figuring out, or realizing a fact.
How is the word nā-ma'loom (unknown) formed?
The root is ma'loom, an Arabic loanword commonly used in Farsi to mean 'known', 'clear', or 'obvious'. Adding the native Persian prefix nā- works exactly like the English prefix 'un-', reversing the meaning to 'unknown' or 'unclear'.

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