It wouldn't be incorrect but it would be very unusual.

No, sorry.

Statements start with 'Mae'

Questions start with 'Ydy'

eg. Morgan wants an orange = 'Mae Morgan eisiau oren' (lit:- Morgan is wanting an orange)

Does Morgan want an orange? = 'Ydy Morgan eisiau oren?' (lit:- Is Morgan wanting an orange?)

It may seem odd having two forms of 'is', but it's because the Welsh word order is 'Verb-Subject-Object.

It's easy for English which is Subject-Verb-Object to indicate a question by changing the word order, Welsh needs to indicate a question by having different forms of a verb.

"a orange" is wrong in English. Words that start with a vowel sound need "an" in front of them.