Learn Turkish: Sütünü bitirene kadar biberonu çıkarmamalısın. - You shouldn't take the bottle out until he finishes his milk.

This uses the grammar pattern of this lesson: Verb + -(y)ene kadar. The verb stem is bitir- (to finish). Because the last vowel is thin (i), we add -ene followed by the word kadar to mean "until finishing".

How do we know it means "until he finishes" if there is no word for "he" in the sentence?

The temporal clause bitirene kadar doesn't change based on who is doing the action; it literally just means "until the finishing". We know the subject is "he" (the baby) entirely from the context and the word sütünü (his milk).

Why are there two -ü suffixes at the end of sütünü?

The first -ü is the possessive suffix making it "his milk" (sütü). Since the milk is the specific direct object being finished, it needs the accusative case suffix -ü at the very end. When we attach an accusative marker to a third-person possessive, we have to use the buffer letter -n-, which gives us süt-ü-n-ü.

Can you break down the suffixes in çıkarmamalısın?