1) Listen to Uhrwerk.
2) "i am create GTA GAME But the car is moving on after"
Simply: Don't do it! You can't, nobody can create a GTA game on his own, esp. when you don't have experience. You only have one life, so invest your time in small but fun projects and don't waste it, success will make you happy, failure won't.

give me exemple

rtfm

use a var

var key_is_pressed = 0;

if (key_a && !key_is_pressed)
{
key_is_pressed = 1;
...
}

But you must set the var somewhere back to 0 that the if() works more

I just told you how to have that set up.

Re-read my post 10 times, or until it makes sense - cause it makes very great sense.