What Is The Problem When Then Car Will Go In Gear But Won't Move?

Well we need more information. Is it a standard or automatic transmission? Was the vehicle acting up before it had this problem? If it is an automatic, check the transmission fluid, may be low. If it is a standard shift, could be the clutch. Post again and let us know about how it was doing before, and if standard or automatic shift.

The car will rev up but does not run.

If its an automatic it might need fluid or it just bad or a clutch it wont move then it needs replaced

Automatic transmission front wheel drive goes into gear and the engine revs but it barely moves if at all