Bilo da zna krvnu grupu bilo da ne zna, pregled počinje.

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Breakdown of Bilo da zna krvnu grupu bilo da ne zna, pregled počinje.

• znati: to know
• počinjati: to start
• pregled: medical examination

Questions & Answers about Bilo da zna krvnu grupu bilo da ne zna, pregled počinje.

What does bilo da ... bilo da ... mean in this sentence?

It is a fixed Serbian pattern meaning whether ... or ..., often with the nuance regardless of whether.

So:

• Bilo da zna krvnu grupu
• bilo da ne zna

together mean something like whether they know their blood type or not.

This structure is very common when you want to say that the result in the main clause stays the same in both cases.

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Is bilo here the past tense form of biti?

It comes from the verb biti historically, but in a sentence like this, it is best understood as part of the fixed expression bilo da.

So for a learner, the most useful approach is:

• learn bilo da ... bilo da ... as a set pattern
• do not try to interpret bilo here as an ordinary past-tense verb meaning was

Also, notice that bilo does not change for gender or number here. It stays the same because the whole phrase functions like a conjunction.

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Why is da used after bilo?