present
I ruin
You ruin
He ruins
She ruins
It ruins
We ruin
They ruin
past
I ruined
You ruined
He ruined
She ruined
It ruined
We ruined
They ruined
future
I will ruin
You will ruin
He will ruin
She will ruin
It will ruin
We will ruin
They will ruin
conditional
I would ruin
You would ruin
He would ruin
She would ruin
It would ruin
We would ruin
They would ruin