in English is:

certain

,

sure

,

undoubted

Mutations

Soft:ddiau
Nasal:niau
Aspirate:(no mutation)
in English is:

tees

Use

y tiau hyn
fy nhiau i
dy diau di
ei diau ef/o
ei thiau hi
ein tiau ni
eich tiau chi
eu tiau nhw/hwy
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