in English is:

substitution

Mutations

Soft:ddirprwyad
Nasal:nirprwyad
Aspirate:(no mutation)

Use

y dirprwyad hwn
fy nirprwyad i
dy ddirprwyad di
ei ddirprwyad ef/o
ei dirprwyad hi
ein dirprwyad ni
eich dirprwyad chi
eu dirprwyad nhw/hwy
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