Learn Turkish: İşçiler ürünleri paketleyince iş bitiyor. - When the workers package the products, the work finishes.

This word is made from the verb root paketle (to package) plus the temporal suffix -ince, which means "when" or "as soon as". Because paketle ends in a vowel, we need to use the buffer letter y before adding a suffix that starts with a vowel. This makes it smoothly connect as paketleyince.

Why does the sentence use ürünleri instead of just ürünler?

Ürünler simply means "products". Adding the accusative case suffix -i turns it into ürünleri, which means "the products". We use this case because the products are the specific direct objects receiving the action of being packaged.

The English translation uses the simple present tense ("finishes"), but bitiyor is present continuous. Why?

In English, we usually use the simple present tense for general rules, routines, or "if X, then Y" statements. In Turkish, however, the present continuous tense (-iyor) is very commonly used for these kinds of everyday facts or immediate sequences, even though its literal translation is closer to "is finishing".

Can the two parts of an -ince sentence have different subjects?