Add effect for a skill when using some skill buff

Hello everyone, please help me solve this problem :

Can I add a effect for a skill (none effect) when used a skill buff in Rpg maker MV ?

Example: I have 2 skill :
skill 1 not have any effect, when I use skill 1 attack monster, It only causes damage for monster.
skill 2 will active effect fire for skill 1, if I used skill 2 then skill 1 will have effect fire and burning monster when I use skill 1 attack it.

I'm trying use common event but I can only active effect fire and burning for all monsters or random monster not the monster that I use skill 1 to attack. Please help me :(
My English not good so sorry if it hard to understand.

Depends on how exactly you want to achieve it, is the buff placed on the player or the monster? In case of the player the "Normal Attack" state and element inherits the Normal Attack Element set through traits (ofcourse this way the regular Attack command will also inherit the very same element so it may not be what you want). If you want to place something on the enemy that changes the element of the skill you're going to have to do something else. I know how to do conditional statements in the damage formula box but I'm not sure how to push the element itself.

Yes, that's my problem, I can't add the element for a skill ( don't have elenment ) when battling.