present
I unfasten
You unfasten
He unfastens
She unfastens
It unfastens
We unfasten
They unfasten
past
I unfastened
You unfastened
He unfastened
She unfastened
It unfastened
We unfastened
They unfastened
future
I will unfasten
You will unfasten
He will unfasten
She will unfasten
It will unfasten
We will unfasten
They will unfasten
conditional
I would unfasten
You would unfasten
He would unfasten
She would unfasten
It would unfasten
We would unfasten
They would unfasten