A loose nut behind the steering wheel :-)
Seriously, what is happening (or not happening) is that the clutch is not being depressed far enough to smoothly change gears OR the clutch plate pads are worn and need to be replaced. Whenever I hear this happening I usually say "Grind me up a few!" We all did this when first learning to drive a stick shift car ... some of us learned on non-syncromesh transmissions.
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