Questions & Answers about Kötü bir şey duyarsanız tahtaya vurun.
How is the 'if' meaning built into duyarsanız?
It uses the Aorist tense plus the conditional suffix. The root is duy- (to hear). First, we add the Aorist suffix -ar (used for general facts or possibilities). Then comes the conditional suffix -sa (if), and finally the formal/plural 'you' ending -nız. Altogether: duy-ar-sa-nız (if you hear).
Why is the word order Kötü bir şey rather than Bir kötü şey?
Why does tahta (wood) have the -ya ending here?
The verb vurmak (to hit / to knock) requires the object you are hitting to be in the dative case (the 'to/towards' direction). So, you add the -ya suffix to tahta (wood), which translates literally as 'hit to the wood'.
Is tahtaya vurmak a common idiom in Turkish, just like 'knock on wood' in English?
Yes, the idiom translates perfectly! Just like in English, Turkish speakers say tahtaya vurmak (and often actually knock on wood) to ward off bad luck after mentioning something negative.