Questions & Answers about Ben çok acele ettim ama otobüse yetişemedim.
How is the "could not" meaning built into yetişemedim?
It is built on the verb root yetiş- (to catch/reach). We add the inability marker -e followed by the negative suffix -me to get yetişeme-. Then we add the past tense -di and the personal ending -m. That little -e- before the negative makes all the difference, turning it into "could not".
What if I accidentally said yetişmedim instead?
If you drop the inability marker -e-, it becomes the regular simple past negative. Yetişmedim simply means "I did not catch (it)", whereas yetişemedim means "I could not catch (it)".
Why does the word for bus take an -e at the end (otobüse)?
The verb yetişmek (to catch, or to make it in time) requires the dative case, which shows motion or direction towards a target. In Turkish, you are literally saying "I could not reach to the bus", which is why we add the -e direction ending to otobüs.
How does acele ettim mean "I hurried"?