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Dylswn … fod wedi – I should have, I ought to have (N)

There are two ways of saying should have or ought to have (which are treated as conceptually the same) in Welsh, using dylwn … fod wedi (south) and dylswn … fod wedi (north). It’s best to be aware of both, and let local usage dictate which one you use.

Use wedi, not yn. Verbnouns such as glanhau, to clean, and the negative particle dim do not take soft mutation after wedi. Dylswn is sometimes used with the affirmative particle mi which causes soft mutation.

Affirmative

EnglishWelshAlternativeExamples
I should have, I ought to havedylswn i fod wedimi ddylswn i fod wedidylwn i fod wedi glanhau
you should have, you ought to havedylset ti fod wedimi ddylset ti fod wedidylet ti fod wedi glanhau
he should have, he ought to havedylsai fe fod wedimi ddylsai fe fod wedidylai fe fod wedi glanhau
she should have, she ought to havedylsai hi fod wedimi ddylsai hi fod wedidylai hi fod wedi glanhau
Carys should have, Carys ought to havedylsai Carys fod wedimi ddylsai Carys fod wedidylai Carys fod wedi glanhau
the girls should have, the girls ought to havedylsai’r merched fod wedimi ddylsai’r merched fod wedidylai’r merched fod wedi glanhau
we should have, we ought to havedylsen ni fod wedimi ddylsen ni fod wedidylen ni fod wedi glanhau
you should have, you ought to havedylsech chi fod wedimi ddylsech chi fod wedidylech chi fod wedi glanhau
they should have, they ought to havedylsen nhw fod wedimi ddylsen nhw fod wedidylen nhw fod wedi glanhau

Interrogative

EnglishWelshAlternativeExamples
should I have? ought I have?ddylswn i fod wedi?ddylwn i fod wedi glanhau?
should you have? ought you have?ddylset ti fod wedi?ddylet ti fod wedi glanhau?
should he have? ought he have?ddylsai fe fod wedi?ddylai fe fod wedi glanhau?
should she have? ought she have?ddylsai hi fod wedi?ddylai hi fod wedi glanhau?
should Carys have? ought Carys have?ddylsai Carys fod wedi?ddylai Carys fod wedi glanhau?
should the girls have? ought the girls have?ddylsai’r merched fod wedi?ddylai’r merched fod wedi glanhau?
should we have? ought we have?ddylsen ni fod wedi?ddylen ni fod wedi glanhau?
should you have? ought you have?ddylsech chi fod wedi?ddylech chi fod wedi glanhau?
should they have? ought they have?ddylsen nhw fod wedi?ddylen nhw fod wedi glanhau?

Negative

EnglishWelshAlternativeExamples
I should not have, I ought not haveddylswn i ddim bod wediddylwn i ddim bod wedi glanhau
you should not have, you ought not haveddylset ti ddim bod wediddylet ti ddim bod wedi glanhau
he should not have, he ought not haveddylsai fe ddim bod wediddylai fe ddim bod wedi glanhau
she should not have, she ought not haveddylsai hi ddim bod wediddylai hi ddim bod wedi glanhau
Carys should not have, Carys ought not haveddylsai Carys ddim bod wediddylai Carys ddim bod wedi glanhau
the girls should not have, the girls ought not haveddylsai’r merched ddim bod wediddylai’r merched ddim bod wedi glanhau
we should not have, we ought not haveddylsen ni ddim bod wediddylen ni ddim bod wedi glanhau
you should not have, you ought not haveddylsech chi ddim bod wediddylech chi ddim bod wedi glanhau
they should not have, they ought not haveddylsen nhw ddim bod wediddylen nhw ddim bod wedi glanhau
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