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the first thing to check would if you can shift through the gears ok with the engine off. If you can it may not be in the transmission.
You could check the fluid level for the clutch. There is a small reservoir near the brake master cylinder. If there is no fluid in the reservoir then either the clutch master cylinder or slave cylinder are leaking. It could be both leaking also.
If the master or slave is leaking you will need to replace those first before you can tell if the clutch is bad.