Apart from this, when I go somewhere I take good care that I don´t look like a child.

My Try.

Thanks for your kind words, gokuyum. Actually it has occurred my mind to write about Turkish language. Not a textbook of course, my skills will never be on that level. Maybe some polemic articles or even fiction. For the time being, though, Turkish syntax is my most important inspiration of style.

You don´t need to acquire the sky in order to gain liberty. It is enough that you don´t sell your soul.

Memnun oldum. Sınıfımıza hoşgeldiniz.

Bana gelince finliyim. Üç yıldır Türkçe öğreniyorum.

Hey wisdom, behind which pretty face are you hiding? I can´t find you.

It seems that we have the same friend then.

Actually we could just say that is the way it is  -  like many rules in grammar. But Turkish grammar is transparent and there is a logical reason for the genitive case.

alt is a noun. It means ´bottom, place beneath´. Thus,

                           masa|nın alt|ı|n|da

has the litteral meaning ´in the table´s bottom side´. Turkish postpositions have developed from place expressions like this into compounds with more abstract meanings like el altında ´accessible´, bu şartlar altında ´in these premises´. Like any compounds they can also have nominative modifiers according to certain rules introduced in many lessons and posts at TC. In my experience, the compounds with genitive modifiers tend to be more concrete: the meaning of ownership or ´a part of a wholeness´ is still visible in them.

Most Turkish postpositions function the same way, like üst ´top, upper surface´ > masanın üstünde, ön ´front´ > masanın önünde, arka ´rear, back side´ > masanın arkasında.

Yes that must be it. Thank you, Nadya..