A useful breakdown is:
kalemtıraşı = kalemtıraş
çantama = çanta
koyup = koy-
kalemi = kalem
sınıfta = sınıf
açtım = aç-
So the structure is basically:
[the sharpener] [into my bag] [putting/after putting], [the pencil] [in the classroom] [I sharpened]
Because it is a definite direct object.
In Turkish, when the object is specific or known, it usually takes the accusative ending. Here, kalemtıraşı means the pencil sharpener / that pencil sharpener, not just a pencil sharpener in a vague sense.
Compare:
So -ı here marks specificity.
Because çantama means to/into my bag.
It has two parts added to çanta:
So:
This is used because koymak normally takes a destination:
So kalemtıraşı çantama koyup means after putting the pencil sharpener into my bag.
Koyup comes from koymak and uses the converb ending -ıp / -ip / -up / -üp.
This form links one action to another and often means:
So koyup here means something like:
It is not fully conjugated because only the main verb of the sentence carries tense and person here. The main verb is açtım.
So Turkish often does this:
In this sentence:
For the same reason as kalemtıraşı: it is a specific direct object.
Turkish often marks specific objects with the accusative:
So kalemi tells you the pencil is definite/specific.
Because sınıfta gives location, while sınıfa would give direction.
Here the sharpening happened in the classroom, so Turkish uses the locative ending -da / -de / -ta / -te.
Also, it becomes -ta instead of -da because of consonant harmony: sınıf ends in the voiceless consonant f, so the suffix uses t.
So:
Yes, açmak often means to open, but with certain objects it has other common meanings too.
With kalem, açmak means to sharpen.
So:
This is a normal Turkish expression. Learners often find it strange because English uses a completely different verb, but in Turkish kalem açmak is standard.
It is built into the verb açtım.
The ending -m shows first person singular, so açtım means I opened/sharpened.
That is why Turkish often leaves out subject pronouns like ben when they are already clear from the verb.
So:
Both are possible, but the second is very common.
Usually, yes.
In this sentence, the natural reading is:
So -up often gives a sequence of actions, especially in everyday narration.
However, it can sometimes be a looser and depending on context. If you want to say strictly after doing X, Turkish can also use a more explicit structure like:
But here koyup is perfectly natural and already strongly suggests the order.
Because koyup is a non-finite verb form, while açtım is the main finite verb.
In Turkish, when verbs are linked with -ıp / -ip / -up / -üp, the earlier verb usually does not show person or tense separately. The last verb carries that information for the whole sequence.
So:
The subject is understood to be the same for both actions unless context says otherwise.
Not completely, but the given order is very natural.
Turkish word order is flexible, though the main verb often comes at the end. The sentence you have is a normal, neutral way to say it.
Current order:
You could move some parts for emphasis, for example:
That still works, but the emphasis changes slightly. Turkish often moves elements around to highlight place, object, contrast, or topic.
So the sentence is not the only possible order, but it is a very standard one.
Because the -up form often does the job of and when the same subject performs both actions.
Instead of saying something like:
Turkish can make it more compact:
This sounds smoother and more natural in many contexts. It is very common in spoken and written Turkish when one person does a chain of actions.
So -up is one of the main ways Turkish links verbs without needing ve.