Look at, see or watch ? - Grammar - Cambridge Dictionary See See means noticing something using our eyes The past simple form is saw and the -ed form is seen: I saw Trevor at the shopping centre yesterday Has anyone seen my glasses?
Person, persons or people ? - Grammar - Cambridge Dictionary To refer to groups of human beings or humans in general, we use people: I saw three people standing on the corner Not: I saw three persons … Jim and Wendy are such nice people People are generally very selfish Three people were interviewed for the job, but only one person had the right qualifications and experience