"Have you shut the shop?"
Translation:Dych chi wedi cau'r siop?
To find a word you don't know simply hover over word in whichever language is being presented to you and it should show you the word in the opposite language.
Wyt is a question form used with "Ti". "Dych" is either a positive statement form or general form (i.e used with questions, postive and negative statements.) used with "Chi".