I haven't seen her
Desde que le pusieron el aparato casi no la he visto sonreír.
Ever since she got braces, I’ve hardly seen her smile.
No la he visto desde ese entonces.
I haven't seen her since then.
No la he visto en la iglesia últimamente.
I haven't seen her at church lately.
— Secret Sunshine (2007)
Aún no la he visto, pero debería ser genial.
I haven't seen it yet, but it should be great.
I haven't seen her since yesterday.
No la he visto desde hace mucho tiempo.
I haven't seen her for a long time.