present

I sign

You sign

He signs

She signs

It signs

We sign

They sign

past

I signed

You signed

He signed

She signed

It signed

We signed

They signed

future

I will sign

You will sign

He will sign

She will sign

It will sign

We will sign

They will sign

conditional

I would sign

You would sign

He would sign

She would sign

It would sign

We would sign

They would sign