You need to be more specific. What skills can't you use? I haven't found any that I can't use but doesn't mean that there are not some. So if you can give more details perhaps people can supply an answer.
Sorry...cant use reverse slash, vampires bane, dark flare, they are at my hot bar but not usable. So i thought that there are some skills not usable in cyrodiil.
So you are a templar. I can tell you all those skills do work in Cyrodiil. What happen was most likely a skill lag which can be annoying. Basically means if there is a lot players around, you can press your key to use skill, and it does nothing, or work after few seconds, but if you are not targeting anyone anymore, skill will simply not work.