Any help would be great:

1. Can I say güzelmiş to mean I´m surprised at how nice something is? Similar to büyükmüş. Or could this mean it was nice? Or it seemed nice?

2. Is this OK in conversation? lütfen, hadi, sorma sorma...

As if to say "c´mon, please don´t ask". I wasn´t sure about the hadi.

3. I still find some cases I don´t understand why senin or benim is used. Here is one where I didn´t understand the senin?

I´ve heard about you - Senin hakkında duydum

I´d like to point out that we never say "Senin hakkında duydum." or "Seninle ilgili duydum." It sounds weird. I guess we could say "Senin hakkında çok şey duydum." or like KediNero said "Senin hakkında bazı şeyler duydum.", but the latter has a sort of a negative cling to it; as in the things you hear about him aren´t really nice. If you mean to say that you´ve heard people talking about a certain person, when you eventually meet him, you can say:

"Sizden bahsetmişlerdi." (They had mentioned you.)

Trust me, this one sounds way better. ^^

Hope it was helpful,

-Jansay

Thanks everyone. But I still don´t get the ´in´ in senin here.

With Senin hakkında çok şey duydum, I understand that as ´I heard (many) things about your´. I know not everything can translate literally. But I´m just stuck on understanding when you apply the ´in´ because I don´t see this as possessive?

Check this link i hope it useful

http://www.turkishclass.com/forumTitle_58642

I was just about to weigh in here, but Moha-ios beat me to it! I asked about this same thing some time ago, as you can see in the thread Moha-ios has linked to.

"Hakkında" is actually a possessive construction. So, it has to take a possessive personal pronoun. Correct, everyone?

But I store "hakkında" away in my mind with "ile," "için" and "gibi," because they also take a possessive personal pronoun. Don´t know exactly why, but they do.

Ah, the possessive is built into hakkında. Looks like Kedi Nero already had shown this as well.