Skill Learn

Would it be passible to make a unit to learn an abilityi he holds an item for about 2min but if he drops before 2mins is up he doesnt learn the ability?

Yes. Detect when the unit gets the item and start a countdown timer that will expire in 2 minutes. Then, create a new trigger that detect when that item is dropped. If it's dropped, stop the countdown timer.

Finally, make a third trigger that will detect when the countdown timer expires. In that trigger's actions, add the ability to the unit and disable the second trigger.

I was trying to create the trigger you said and i think it would be an easier,please tell what you think of it

Well, I suppose that would work too... but I just like timers myself.