"Oes, mae rhaid i fi smwddio."
Translation:Yes, I must iron.
When the sentence starts with Oes , as in this case, is it mandatory to use bod (i.e. mae rhaid i... or mae'n rhaid i..., as opposed to rhaid i... ), or is it still a free choice?
In other words, would
Oes, rhaid i fi smwddio
be equally grammatical?
Yep, equally grammatical. You must include it after a question word however, as in:
Beth mae rhaid i ti wneud? "What do you have to do?"
Faint mae rhaid i fi gofio? "How much do I have to remember?"
Ble mae rhaid iddi hi fynd? "Where does she have to go?"
So, if I understand this rule correctly , besides the interrogative sentence that begins with oes (e.g. oes rhaid i ti fynd?), any other that begins with a question word takes the following construction:
question word + mae rhaid i + pronoun + verb
Am faint o'r gloch mae rhaid iddyn nhw fynd i'r gwely?
Sut mae rhaid i fi olchi'r crys newydd?
Ble (Lle) mae rhaid iddo fe (fo) adael y beic?
Is this correct?
Yes and also always with possession, because the question starts with 'Oes'
eg 'Oes rhaid i chi smwddio? = Do you have to iron (lit:- Is there a necessity for you to iron)
Answer:- Oes, rhaid i fi smwddio.
Similarly 'Oes siocled gyda chi? = Do you have chocolate (lit:- Is there chocolate with you?)
Oes, mae siocled gyda fi.