"She saw a friend."
Translation:Gwelodd hi ffrind.
The letter ff does not mutate. There is probably a mutations table in the course notes somewhere, or look here - https://www.cs.cf.ac.uk/fun/welsh/AppendixA_main.html
Thank you: good point. I keep making that mistake! It must be a dim recollection of trying to learn Irish once and knowing that f underwent aspiration (even though the result is different).