"Where's the new factory?"
Translation:Ble mae'r ffatri newydd?
Mae follows 'ble' in general.
The role of 'ble' is to turn the statement into a question without altering it.
The question words ble?, pam?, pryd? and sut? (when it means 'how?') , are all followed by mae, bydd, (r)oedd, (r)wyt, etc forms of bod and by unmutated forms of other verbs:
- Ble (r)wyt ti'n mynd? - Where are you going?
- Pam byddwch chi'n prynu car newydd? - Why will you be buying a new car?
- Sut (r)oedd e'n teithio? - How was he travelling? How used he to travel?
- Sut mae? - How are (things/you)?
- Sut daeth Dewi i'r swyddfa ddoe? - How did Dewi come to the office yesterday?
The r- in some forms of bod is often dropped in the colloquial language.
(edited to add examples)
So would it be, "Pam mae wyt ti mynd?" or "Ble mae wyt ti mynd?" - why/where are you going?