What is difference between üzerine and üstüne?

anyone who can answer please?

We have a word "üzer". But we never use it in nominative case, we always conjugate it.

...in üzer+i(possessive)-------->...in üzeri (the onside/aboveside of the ...) [any given declension of the definite possessive determiner, not a special type.]

Kitapları masamın üzerine bırakabilirsin. (You can leave the books onto my table.)

Not yazdığım kâğıtların üzerine çay döküldü. (Tea was poured down onto the papers which I was writing notes.)

Benim defterimin üzerinde çiçek resmi var. (There is a flower picture on my notebook.)

... üzerine = about ...

edebiyat üzerine/üstüne*/hakkında kısa bir makale (a short essay about the literature)

Anadolu tarihi üzerine/üstüne*/hakkında bir tez (a thesis about the history of Anatolia)

*üstüne is almost never used for this situation.

Senin üzerine konuşuyorduk (We were talking about you.) Benim üzerime mi konuştular? (Did they talked about me?) etc.,

So as to be able to use "üzerine", there must be subject.

Dün hocayla yaptığın tartışma üzerine/hakkında pek konuşulmadı. (One didn´t talk about the arguement you did to teacher yesterady.)

*hakkında is much more preferred.

... üzerine = 1just after the ... , in the wake of ..., 2considering the ...

Bu haber/haberin* üzerine hemen kalktı ve vergi dairesine gitti. (He immediately stood up in the wake of these news and went to the tax office.)

*It doesn´t make any big difference to use nominative or genitive.

Bu davranışın üzerine seni gerçekten kutlamak istedik. (We really want to congragulate you after* your this behaviour.)

*The hidden meaning: We saw your this behaviour, and considering it, we want to congragulate you.

üst (onside)

Kitapları masamın üstüne bırakabilirsin. (You can leave the books onto my table.)

Benim defterimin üstünde çiçek resmi var. (There´s a flower picture on my notebook.)

Belki üstümüzden bir kuş geçer. (Perhaps a bird goes on us.)

Annemin çalıştığı yer postahanenin üstünde. (Place where my mother works is on the post office.)

"üzerinde" is wrong here.

hidden meaning: upstairs of the post office

Klavyemin üstüne/üzerine bir parça kek düşmüş. (A piece of cake has fallen down onto my keyboard.)

Onların evi bizim evimizin iki kat üstünde. (Their house is two storeys higher than our house. (direct: Their house is on our house for two storeys))

"üzerinde" is well-nigh wrong here.

çok teşekkür ederim Mehmet.

I´m Turkish and I´ve asked this to myself several times. I thought it was like two ways of saying the same thing. You know, like... I don´t know, like "Jenny" and "Jennie". Or an example from Turkish, "gene" and "yine". Mehmet, do you have an explanation for "gene" and "yine"?

By the way, I´ve replaced "üstüne" with "üzerine" and vice versa in all Mehmet´s examples. I think no meaning was lost. Don´t worry about this minor point. I say you can use them interchangeably. Even natives do not know the difference. It´s like an American guy writing "your" instead of "you´re" or "their" instead of "there". Only much much much subtler. So very much.

And if a Turkish teacher is grading you based on this, either

a- You´re studying to be a badass Turkish language expert.

b- Fuck that teacher.

Awaiting Mehmet´s comments on "yine" and "gene".

Türkçe öğretmenliği falan okumuyorum, bu benim için yalnızca bir hobi. (I´m not studying on the departmen of Turkish teacher, this is just a hobby for me.)

"yine" ile "gene" arasında hiçbir fark yok. Ha, varsa da bu akademik düzeydeki profesörlerin ya da onlardan öğrenmiş insanların açıklayabileceği bir şey. (There is no difference between "yine" and "gene. But, even if there is, this is something that just the professors, who are on the academical level, or the people, who have learnt from them, can explain)

Affedersiniz, ama bu cümleler Türkçe´de söylesem nasıl olacak?

GulBahar: 

1. Senin hakkında konuşuyoruz.

2. Benim hakkımda konuştular mı?

Sanırım öyledir Yani ben Türk değilim ama en azından buna cevap verebilirim

Senin hakkında konuşuyorduk / sizin hakkınızda konuşuyorduk

Benim hakkımda mı konuştular?

Both dany98 and KediNero correctly translated the second sentence. The difference is, the emphasis on different words. In English, that would be achieved by intonation. In Turkish, the location of "-mı" the question particle sets the emphasis.

For the first sentence, the champion is KediNero. What dany98 wrote means "we ARE talking about you".

And GulBahar,

Might what you meant be "her şey için gerçekten teşekkür ederim"? With an M at the end?

And GulBahar,

We´ve wandered off of the topic. The seventh message in this page is yours and it disrupts the flow. Why didn´t you start a new title? Are you shy?

Benim hakkımda konuştular mı (it´s like you expect from them to talk about you)

Benim hakkımda mı konuştular (it´s like you just heard it from someone and you are surprised to hear that they talked about you)

üzerine means the surface of something. "masanın üzerine" defines the exacty 2d surface of the table. when you say üstüne then you start to define a mass as well. like "masanın üstünde hava toplanmış". then 3d comes into place.

by figurative means there arent many differences. you just dont use some with the other sometimes. for example it doesnt sound very accurate to say "bu konu üstüne bir şey söylemedi" but rather "bu konu üzerine bir şey söylemedi". also you can say "bu tür şeyler üst üste geldi" but cant really say "bu tür şeyler üzeri üzerine geldi". the only way to know where to use which one is to learn by listening the each idiom or figuarive speakings.

but they are very close in meaning so dont even bother memorizing the nuance

@Olphon

You´re right sorry I didn´t remember exactly the sentence and I put the present yes, it should be senin hakkında konuşuyorduk, in the past

@dany98

Bi daha olmasın.

___

This post of mine may only seem like a witty comeback but it has an educational value too. "Bir daha olmasın" is a cliche response that is meant to be funny. Used when someone apologizes unnecessarily. There, you learnt one more thing.

"Eğlenirken öğrenmek" is what you´re doing when you read my messages. See, I did it again. You´ve just experienced another colloquial expression: "Eğlenirken öğrenmek"

@Olphon

Herşey için çok teşekkür ederim

Let me add what I know:

-arı/-eri is a direction suffix

iç = in -> iç-eri  = to the inside, inward

dış = out (archaic form taş, seen in taş-ra today) -> dış-arı  = to the outside, outward

? -> geri = to the back, backward

ilk = first, fore -> ileri (ilg-erü = to the ahead, foreward

alt = bottom, below -> aşağı (alt-aru) = to the below, downward

yok (a stem seen in yok-uş today) -> yukarı (yok-aru) = to the top, upward

üst = top, above -> üzeri (üst-erü = onto the top, topward (is there such a word?)

even

neri = to the what (direction)

In my region we prefer "neri" to "nereye" (where) maybe because it´s shorter.

I usually say for example:

Neri gidiyorsun? = where are you going?