A school exchange: formal 'you' and informal plural 'vous'

The SSC [oy] sounds like [oi] + 'yih', like the [oy] in 'envoyer', which means 'to send'. The pronoun 'vous' means you (pl), but it can also mean you (sing) when you talk to one person in a formal situation. This could be an older person, someone in a position of responsibility or an adult you don't know well. We use 'tu' for you (sing) in informal situations, such as when we talk to friends, family and children. There are two ways of saying please in French: 's'il te plait' (informal) and 's'il vous plait' (formal).