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
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.
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.
Yes i can : )
No they are two diffrent games.
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.