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I know what he meant.
Make a string actor variable called "right"
1. Player :
Keydown>Left>

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right=0;
x-=3;
ChangeAnimation("Event Actor", "PlayerWalkLeft",FORWARD);

Keydown>Right>

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right=1;
x+=3;
ChangeAnimation("Event Actor", "PlayerWalkRight",FORWARD);

Keyup>Left

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ChangeAnimation("Event Actor", "PlayerStopLeft",FORWARD);

Keyup>Right

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ChangeAnimation("Event Actor", "PlayerStopRight",FORWARD);

Keydown>Shoot

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if(right==0)
{
   ChangeAnimation("Event Actor","PlayerShootLeft",FORWARD);
}
if(right==1)
{
    ChangeAnimation("Event Actor","PlayerShootRight",FORWARD);
}
//CreateActor>Ammo

2. Ammo
CreateActor>

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if(Player.right==0)
{
   angle=180;
}
if(player.right==1)
{
    angle=0;
}
directional_velocity=15;