wyt ti? wyt ti is not wrong!!
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It says that "Wyt ti moyn het a sgert?" is also correct... But I swore that "moyn" was a verb that needed "yn" with it, therefore making it "Wyt ti'n moyn het a sgert?"? Can any Welsh speakers help me out?
Not a native speaker, but since 'moyn' is a normal verb ('eisiau' is an exception), there should be an 'yn' there. So you are absolutely correct!