While or when? -ken & -ince

-ken means while: two things happen at the same time. On a verb it follows the aorist: gelirken (while coming), okurken, uyurken. It has only one shape (no vowel harmony). In a story about something in progress, -iyorken is also possible: geliyorken.

After a noun or adjective, -ken (after a vowel -yken) means when I was / while being: çocukken (as a child), hastayken, İstanbul'dayken.

-ince (-ınca, -unca, -ünce; after a vowel -yince) means when, once: the first action is finished and the second follows: gelince, görünce, uyanınca. The personal form -dığımda / -dığında means the same and shows who: geldiğimde (when I arrived).

Aorist + -maz means as soon as: iner inmez, görür görmez.

Tip: yolda (on the way) points to -ken, hemen (right away) to -ince.