Learn Turkish: Seramiği dikkatli fırınla, yoksa çatlar. - Fire the ceramic carefully, otherwise it will crack.

There is no past tense verb here, but the word yoksa (otherwise) uses the same conditional copula -(y)sA you are learning. It comes from yok + ise, literally meaning 'if it is not'. If you wanted to rewrite the consequence using the past conditional from this lesson, you would say: Dikkatli fırınlamadıysan çatlar (If you didn't fire it carefully, it will crack).

How is the verb 'fırınla' formed?

It comes from the noun fırın (oven or kiln). The suffix -lA turns nouns into verbs, so fırınlamak means 'to bake' or 'to fire'. Here it is conjugated in the informal imperative: fırınla (fire it!).

Why is the aorist tense used in 'çatlar' (it will crack) instead of the future tense 'çatlayacak'?

At the B2 level, it is important to remember that the aorist (-Ar / -Ir) is used for natural consequences, scientific facts, or inevitable outcomes. Because cracking is the expected physical reaction of poorly fired ceramic, çatlar sounds much more natural and factual than the future tense.

Why does 'seramik' change to 'seramiği'?