"Dych chi'n hoffi Megan?"
Translation:Do you like Megan?
So it's basically something like this?: Dych - do (to indicate that it's a question? Not sure what's it's function here) Chi - you, Yn - are, Hoffi - to like, forming "are you liking". And Chi + Yn = chi'n because of the similarity of sounds for "i" and "y". BTW If I were to ask simply: "Chi'n hoffi Megan?" would that still work as a question or is "dych" mandatory?