To watch = Mirar Watch (time) = Reloj
Mirando fútbol.
"I am watching sports" would be "estoy mirando deportes".
viendo la televisión
Te estoy observando.
Mirando el futból.
Estoy mirando el televisor.
Me gusta ver la televisión.
In Spanish, I'll be watching you is this: Estare mirandote (accent on the second 'e' and the 'a'). It's either that or Te guardare/vigilare (accent on final 'e')
You could say Qué estás viendo? or Qué ves?Both would mean 'what are you watching?'
"(Ellos) estan viendo un videoclip"....yes they say "videoclip"....how original lol
¿Por qué ve / ven / ves / veis la tele?
To answer this completely, you would need to supply more context. In Spanish, the verb form changes depending on who does the action. "I am watching" is different than "we are watching". "Estoy mirando videos" means " I am watching videos", while "Estamos mirando videos" is "we are watching videos". It is also valid to say "yo miro videos" or "miramos videos".