Listened to Say Something in Welsh: Old Course 1, Lesson 3 from saysomethingin.com

To finish - cwpla
To buy - prynu
To come - dod
To sleep - cysgu
To take - cymryd
To see - gweld
I'm going to speak - Dw i'n mynd i siarad
I'm not going to speak - Dw i ddim yn mynd i siarad
You're going to speak - Ti'n mynd i siarad
You're not going to speak - Ti ddim yn mynd i siarad
I spoke - Wnes i siarad
I didn't speak - Wnes i ddim siarad