Call of Duty: mw4 isn't out yet, but you would definitely be able to support single player, if it ever comes out. it seems cod mw3 is the last one i think, but if you are talking about cod4: mw1 then you can definitely play singleplayer
Yes, you can. You can play the campaign offline and against friends in split-screen mode.
no
The PSP does not have a Call of Duty game so it can not play any Call of Duty offline or onliine
Gamemaster4474-- No, in Call of Duty: Modern Warfare 2, in offline, or also known as Local Play, you can have up to 4 players, but that is if you have 4 controllers.
Yes i can : )
No they are two diffrent games.
If you are in a private offline match, yes, you level up just like you do online and you will unlock the class customization at level 4.
No, Ghost does not appear in Call of Duty 4: Modern Warfare, but the same voice actor (Craig Fairbrass) who voiced Ghost in Modern Warfare 2 also voiced Gaz from Call of Duty 4: Modern Warfare. As for the Perk "Ghost", No It does not appear but instead "UAV Jammer" is the replacement.
Yes.
Yes You Can
Practice
No
No. There is no co-op campaign in Modern Warfare, local or online.
Yes.