Regarder means to look at. Je regarde Marie qui a prise une
tarte (I am looking at Marie who took a pie). It is different from
voir- to see. Voir is usually used for a film or movie (eg. je vois
un film).
In French, Regarder is the infinitive verb for "to look" or "to watch", as in "Regarder la finêtre (Look/Watch the window)".
Can I watch? Puis-je regarder? I can watch. Je peux
regarder.
What does the French sentence regarder passer un examen mean?
'passer un examen' means 'to take / to sit an exam' in English.
(That doesn't mean that you actually pass it). Regarder is 'to
watch, to look at', so regarder passer un examen means 'to look at
[someone] taking an exam'