so you wouldn't use y or yr because the word before ends in a vowel?
Dw i'n hoffi'r ci.
Dw i'n gweld y ci.
Dw i'n gweld yr arth.
Why is it not "dw i'n" since I'm guessing this is a momentary need as opposed to a constant state ?
There is no 'n/yn used with the noun eisiau.
See the course notes for 'Wanting' - https://www.duolingo.com/skill/cy/Wanting/tips-and-notes