Learn Turkish: Saldıran vahşi ayıdan kaç, yoksa seni ısırır. - Run away from the attacking wild bear, otherwise it will bite you.

Yoksa is made of the word yok (non-existent) and the conditional suffix -sa (if). Literally, it means 'if not.' Here, it connects the two ideas to mean 'otherwise' or 'or else'—meaning 'run away, because if you do not, it will bite you.'

What is the -an ending doing on the word saldıran?

It changes the verb saldırmak (to attack) into a describing word (an adjective). The -an/-en suffix means 'who' or 'which' does the action. Here, saldıran means 'attacking' or 'the one which is attacking.'

Why is it ayıdan (from the bear) instead of just ayı?

In Turkish, the verb kaçmak (to run away or escape) requires you to show what you are running away from. Because of this, you must attach the ablative 'from' ending (-dan/-den) to the bear, making it ayıdan kaç.

Why does ısırır use the simple present (aorist) tense instead of the future tense (ısıracak)?

Isırır is formed with ısırmak (to bite) and the -ır simple present tense ending. When giving warnings or stating natural consequences after yoksa, Turkish speakers very often use this tense instead of the future tense to say what generally happens as a result.