Welcome

[Vawmataw]

A good lesson. I invented the discussion, but the explanations are TRUE.

Me: Kaltxì ma smukan sì smuke! How do you say Welcome in Na'vi?
Everyone: Zola'u nìprrte'.
Me: Yes, BUT see first Na'viteri. We write Ziva'u nìprrte at the top right.
A random dude: But which is the right one?
Me: Both. I think we should prefer Ziva'u nìprrte. I say that, but everyone has an opinion!
A good person: Do not make so much confusion.
Me: No, I don't. We have to decide together.

[Kemaweyan]

Zola'u nìprrte' - you say when person already came in.
Ziva'u nìprrte' - you say when you invite person to come in.

[Tirea Aean]

Zola'u nìprrte' - you say when person already came in.
Ziva'u nìprrte' - you say when you invite person to come in.

This.

[Vawmataw]

Interesting.

[Kamean]

Zola'u nìprrte' - you say when person already came in.
Ziva'u nìprrte' - you say when you invite person to come in.

This.

IMHO it's obvious.

[Ftiafpi]

Zola'u nìprrte' - you say when person already came in.
Ziva'u nìprrte' - you say when you invite person to come in.

This.

One of <iv>'s many uses is to also to give commands. For example, in the film when Tsu'tey is leading Jake and the other young Na'vi up Iknimaya and he tells them to jump to the vine he says "kivä ko!"

[Tirea Aean]

Zola'u nìprrte' - you say when person already came in.
Ziva'u nìprrte' - you say when you invite person to come in.

This.

One of <iv>'s many uses is to also to give commands. For example, in the film when Tsu'tey is leading Jake and the other young Na'vi up Iknimaya and he tells them to jump to the vine he says "kivä ko!"

... which isn't quite directly a command but a firm suggestion given context?

But yeah, you're right; the difference here is the <ol> one is a statement of fact almost, and the <iv> one is more or less a command that has <iv> in it.

[Ftiafpi]

... which isn't quite directly a command but a firm suggestion given context?

Suggestion then.

[Blue Elf]

Zola'u nìprrte' - you say when person already came in.
Ziva'u nìprrte' - you say when you invite person to come in.

This.

One of <iv>'s many uses is to also to give commands. For example, in the film when Tsu'tey is leading Jake and the other young Na'vi up Iknimaya and he tells them to jump to the vine he says "kivä ko!"

A time ago <iv> in command was understood as a (more) polite command, but it is not rule at this time. Still it is used this way.
but:
(nga) kivä - is command to another person (go!)
kivä ko - is encouragement to group of people (let's go!)