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Byddwn i - I would
This is the conditional form of bydda (will) and means 'would'. It uses similar endings to other auxiliary or modal verbs e.g. dylwn -should , gallwn - could and hoffwn - would like. Byddwn is followed by “yn + verb noun” and does not cause a mutation in the verb that follows (see examples below).
Byddwn i'n rhedeg ond dwi wedi blino . - I would run but I'm tired.
Bydden nhw'n sylwi ar y gwahaniaeth. - They would notice the difference.
Southern Welsh uses byddwn whilst baswn is used in the north e.g.
Baswn i'n rhedeg ond dwi wedi blino . - I would run but I'm tired.
Basen nhw'n sylwi ar y gwahaniaeth. - They would notice the difference.
N.B. In the northern dialect the first syllable ( ba , fa ) is often dropped in everyday speech.
To form the perfect tense - 'I would have , you would have' etc we simply substitute 'wedi' for 'yn'. This does not cause the verb to mutate. Examples:
byddwn i, (ba)swn i I would
byddet ti, (ba)set ti You (familiar) would
byddai e,o,fe (ba)sai fo He would
byddai hi, (ba)sai hi She would
bydden ni, (ba)sen ni We would
byddech chi, (ba)sech chi You (formal & plural) would
bydden nhw, (ba)sen nhw They wouldNEGATIVE
fyddwn i ddim / (fa)swn i ddim I wouldn't
fyddet ti ddim / (fa)set ti ddim You (familiar) wouldn't
fyddai e/o/fe ddim / (fa)sai fo ddim He would not
fyddai hi ddim / (fa)sai hi ddim She would not
fydden ni ddim / (fa)sen ni ddim We would not
fyddech chi ddim / (fa)sech chi ddim You (formal & plural) would not
fydden nhw ddim / (fa)sen nhw ddim They would not
fyddwn i? / (fa)swn i? Would I?
fyddet ti? / (fas)et ti? Would you (familiar)?
fyddai e/o/fe? / (fa)sai fo? Would he?
fyddai hi? / (fa)sai hi? Would she?
fydden ni? / (fa)sen ni? Would we?
fyddech chi? / (fa)sech chi? Would you (formal & plural)?
fydden nhw? / (fa)sen nhw? Would they?
byddet/na fyddet, byddech/na fyddech
byddech/na fyddech, bydden/na fydden
byddwn/na fyddwn, bydden/na fydden