"Are you wearing a school uniform?"
Translation:Dych chi'n gwisgo gwisg ysgol?
Dych chi / Dach chi (South / North) - Polite/formal singular "you"; plural "you". The "chi" form is used either to be respectful (use with elders, professionally, people you don't know well) or to address more than one person.
Wyt ti - Singular informal "you".
Ti can only be used to address one person and can only be used with:
- Close friends
- Close family
- Children (any and all)
In some areas (like North West Wales) ti is often chdi. You don't need to ever use chdi but it's worth noting in case you hear it.
Sut wyt ti? - "How are you?" (singular and familiar)
Sut dych chi? - "How are you"? (singular formal OR plural)
Mi es i i Fangor efo chdi - "I went to Bangor with you" (singular and familiar)