The only Welsh I know is iechyd da.
Here's a Welsh phrase book that might be useful.
Consecutively, in the guide you linked to :
"
I can't speak Welsh [well].
Alla i ddim siarad Cymraeg [yn dda]. (Alh'a ee thim SHARad kym-RYE-g [uhn tha])
Do you speak English?
Ydych chi'n siarad Saesneg? (UD-ich ch'een SHARad SAYES-neg?)
Is there someone here who speaks English?
Oes rhywun yma sy'n siarad Saesneg? (Oyss RHEEW-in UMma seen SHARad SAYES-neg?)
Help!
Help! (Help)
"
Nos da
Ian