Problem with keyboard input

Hey guys. Right now I`m making a commander game. In the game his 1st weapon is a bow..

My problem is . I want when player press Space it immiedetly shoot. But when player hold Space it can take awhile for aiming . But theres no Hold at keyboard input.. So i just thinking,since there is no Hold Button at keyboard in put. Is there any creative ways to do it? .

Thanks

There is "Key Down" as opposed to "On Key Pressed". Not sure what your question is.

Well I`m trying to ask like mouse we have hold left click.. SO do we got hold button for keyboard. Have u play sniper game before? SOme of them like we need to hold V to ultimate melee , if we dont it just normal attack