in English is:

ground bass

Mutations

Soft:(no mutation)*
Nasal:ngrwndfas
Aspirate:(no mutation)

* This form is an exception to the mutation rules.

Use

y grwndfas hwn
fy ngrwndfas i
dy grwndfas di
ei grwndfas ef/o
ei grwndfas hi
ein grwndfas ni
eich grwndfas chi
eu grwndfas nhw/hwy
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