"I'm ready, you know."
Translation:Dw i'n barod 'sdi.
ch'mod? is a contraction from dych chi'n gwybod? (the m here is probably to do with a bit of internal consonant mutation which we will steer clear of...).
'sti/'sdi is a contraction from wyddost ti? (a present tense form (not taught on this course) of gwybod meaning 'do you know?')