NOPE
Probably not ONLY covenant, but Halo 2 already has about half of its levels where you play in the life of the Arbiter, one of the Elites shamed after losing the first Halo ring. Both Halo 2 and Halo 3 allow you to play as an Elite in Multiplayer, and Halo 3's co-op allows you to play as the Arbiter for the second player. I hope this answered your question.
In Halo 3 the covenant does die, the covenant will never be in another Halo game.
You cannot play as Covenant in the original Halo
Yes, in Halo Wars you will be able to play as the Covenant. I dont know, however, if you will be able to play a story mode as the Covenant, but I know that you will be able to in Free Play and Xbox Live.
i believe you play as covenant in halo 2 because i think they wanted to give you something different in it and the story wouldn't really make sense if you didnt play as them.
You build a factory
no
no... its before Halo 1 when the humans have just started fighting with the Covenant
ghost town and covenant
Sorry to tell you but... She got shot with a Spiker at the end of the Halo 3 Level, "The Covenant."
Not exactly. Instead of a Halo "4", Bungie have decided to release Halo:ODST. This game bridges the gap between Halo 2 and Halo 3. You play as an ODST marine in the game. Also, for RTS fans, Bungie have also made Halo Wars, a strategy version of Halo, in which you can play as either the marines or the covenant.
A Ghost is a Covenant vehicle in the Halo franchise. A link with a picture is provided below.