Tara šešai

[Plusquamperfekt]

Kwamišan Nimišorak ya masimančwi forumoras šika kwanš cenžišan hiwko žwenik ya yežanš zužiwa thonšuro Navki. Khanšiman astaro ačafiman kithonši tahonti šukjanši lišanjai maya!

In English:
Hello,
I'm from Germany and I came to your forum as I really love conlanging and I would like to learn more about Navi. I hope that I'll find many people who share my hobby!

[Kamean]

Kaltxì ma tsmuk ulte zola'eiu nìprrte'!

Welcome on the most friendly forum in the world.
At first I advise you come to this stuff and read this language studying tips. If you want pick language easier, it's only one way - try to speak. And don't be afraid of errors and ask all that you don't understand. Everyone here will be glad to help you.

And listen this Karyu Pawl speech (with English translation), it helps you pronounce difficult Na'vi sounds.
and this one as well by him:

http://masempul.org/2010/04/trr-%E2%80%99rrtaya-2/

and also this one by him found on his blog, Na'viteri:

http://naviteri.org/2010/07/ting-mikyun-fte-tslivam-listening-comprehension-1-3/

Eywa ngahu.

Kwamišan Nimišorak ya masimančwi forumoras šika kwanš cenžišan hiwko žwenik ya yežanš zužiwa thonšuro Navki. Khanšiman astaro ačafiman kithonši tahonti šukjanši lišanjai maya!

What is this language?

[Plusquamperfekt]

This is Miwonša, my personal conlang. Even though I had started to create it long before I watched Avatar the first time, it shares some interesting features with Na'vi, for example it has a tripartite ergative-accusative alignment and ejectives. I just thought it would be a funny (maybe also a little provocative) idea to introduce myself in another conlang.

Just in case you're interested, a little glossing of the sentence above:
COP-1SG-IND Germany-LOK-GEN.SG and come-1SG-IND=PFV forum-LOC-DAT.SG 2PL.GEN COP-IND-CVB creator-INT.SG enthusiastic-INT.SG language-GEN.PL and want-IND-CVB know-INF much-COMP Navi-GEN.SG. hope-1SG-IND that=FUT find-1SG-IND VIR-much-ACC.PL human-INT.PL share-IND-PTCP-ACC.PL hobby-ACC.SG 1SG.GEN  

['Oma Tirea]

You should check out the linguistics forum.  There's some interesting stuff there

[Dreamlight]

Wilkommen auf Learnnavi.  Make yourself comfy and feel free to ask any questions.  

[Ikxeru]

Kaltxì ulte zola'u nìprrte'.

Tse, nga pamrel sami nìMiwonša, kefyak? Eltur tìtxen si!
Tsun oe tsive'a futa ngal omum pxay tìtxulateri lì'fyaoä, fte oel sresive'a futa nga tsun nivume lì'fyat leNa'vi nìwin.
Srake, kxawm new nga nivìn plltxetsengevit leToitsye kop?  Tìng nari.

Sngìmä'i aynumeyuä lì'fya'olo amip nivume lì'fyat leNa'vi ulte nga tsatsun livu hapxìturu a lu fohu.

Tse, tsakrrvay etrìpa syayvi lu ngar ulte Eywa ngahu!

- ta Ikxeru

[Human No More]

Kaltxi!

Sounds like you know your stuff with languages.