The preposition i is used with many other words as well as rhaid. We need to conjugate i after cyn (before) and ar 么l (after). Remember that the verb will mutate:
Rhaid i mi fynd.
I have to go.
Cyn i mi fynd.
Before I go.
听
Cyn
Ar 么l
I
Cyn i mi fynd.
Ar 么l i mi fynd.
You
Cyn i ti fynd.
Ar 么l i ti fynd.
He
Cyn iddo fo fynd.
Ar 么l iddo fo fynd.
She
Cyn iddi hi fynd.
Ar 么l iddi hi fynd.
We
Cyn i ni fynd.
Ar 么l i ni fynd.
You (plural/formal)
Cyn i chi fynd.
Ar 么l i chi fynd.
They
Cyn iddyn nhw fynd.
Ar 么l iddyn nhw fynd.
Be' wnest ti ar 么l i ti gael swper?
What did you do after you had supper?
Be' wnaeth y plant cyn iddyn nhw fynd i'r ysgol?
What did the children do before they went to school?
Welsh in the Workplace
