Translation: Lo vi OR Lo he visto.
Me viste en la escuela - You saw me in school.
Te vi hoy.
vi a su nena
Translation: Acabo de ver
Yo ya lo vi.
Translation: Cuando yo caminaba, vi...
In the case of I have seen it would be "yo vi" the verb ver is "to see" in spanish. vi is the singular past tense conjugation. For a saw that cuts use sierra to say I am cutting with a saw I'd say yo sierra utilizo...the singular form of utilizar but there is probably a better way to say this.
you can say "y tambien ví baños para hombres y mujeres."
Translation: Desde la primera vez que te he visto...
Sierra is a Spanish word meaning 'saw'. Since a mountain range resembles a saw with the mountains forming the teeth, it also figuratively means 'mountain range'.
Same way in English, only with softer A's SAW-VAWN-AW, i guess is how an English speaking person would say it
Saw, as in chain saw.