There could easily be several problems. Try to deal with them one by one. Fix one and move on to the next, or else it is going to be a total mess without any resolution.We started with dragging clutch. I think I figured out the way to tell where to look for solution. With the engine off, try to fix the lever on the clutch housing in the fullydisengaged position somehow. Then start the engine and try to switch gears. If you still can't, the problem is fork or throwout bearing - read inside the clutch housing. If you can, the problem is outside the housing, most probably what TheShimster91HBsaid.