Inscriptions

How do I know if a weapon is inscribeable or not? I'm looking to buy a new bow and it'd be nice if I could put an inscription on

It's easy to find out. Just click on the weapon you want to craft and look at its stats. There will be something that says "Inscription: None" if it's inscribable

what if it doesnt even have "inscription" in the stat box?

and how come in the auctions here, many say inscribable but they already have inscriptions on them? are they lying?

If it is inscribable, it will state in the items stats that it has an inscription slot. Inscriptions can be removed or changed, so if it has an inscription on it already, it is obviously inscribable. Example:

Furious Great Axe of Fortitude
6-28 Slashing Damage (req 9 Axe Mastery)
Double Adrenalineon hit(10%)
Health +30
Inscription: Strength and Honor 15% damage(when health is above 50%)

That item would be inscribable, and already have an inscription on it. If it had the same stats, but no inscription, it would look like this:

Furious Great Axe of Fortitude
6-28 Slashing Damage (req 9 Axe Mastery)
Double Adrenalineon hit(10%)
Health +30
15% damage(when health is above 50%)