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defnyddio

to use

"defnyddio" means "to use" in Welsh. Full conjugation table with present, imperfect, preterite, future, conditional, and imperative tenses.

Present

Presennol

PersonForm
I (fi)defnyddiaf
You sg. (ti)defnyddi
He/She (fe/hi)defnyddia
We (ni)defnyddiwn
You pl. (chi)defnyddiwch
They (nhw)defnyddiant
Impersonaldefnyddir

Imperfect

Amherffaith

PersonForm
I (fi)defnyddiwn
You sg. (ti)defnyddit
He/She (fe/hi)defnyddiai
We (ni)defnyddiem
You pl. (chi)defnyddiech
They (nhw)defnyddient
Impersonaldefnyddid

Preterite

Gorffennol

PersonForm
I (fi)defnyddiais
You sg. (ti)defnyddiaist
He/She (fe/hi)defnyddiodd
We (ni)defnyddiasom
You pl. (chi)defnyddiasoch
They (nhw)defnyddiasant
Impersonaldefnyddiwyd

Pluperfect

Gorberffaith

PersonForm
I (fi)defnyddiaswn
You sg. (ti)defnyddiasit
He/She (fe/hi)defnyddiasai
We (ni)defnyddiasem
You pl. (chi)defnyddiasech
They (nhw)defnyddiasent
Impersonaldefnyddiasid

Future

Dyfodol

PersonForm
I (fi)defnyddia i
You sg. (ti)defnyddi di
He/She (fe/hi)hi o
We (ni)defnyddiwn ni
You pl. (chi)defnyddiwch chi
They (nhw)defnyddiant nhw

Conditional

Amodol

PersonForm
I (fi)defnyddiwn
You sg. (ti)defnyddit
He/She (fe/hi)defnyddiai
We (ni)defnyddiem
You pl. (chi)defnyddiech
They (nhw)defnyddient
Impersonaldefnyddid

Imperative

Gorchmynnol

PersonForm
I (fi)-
You sg. (ti)defnyddia
He/She (fe/hi)defnyddied
We (ni)defnyddiwn
You pl. (chi)defnyddiwch
They (nhw)defnyddient
Impersonaldefnyddier

Example sentences

Ga i defnyddio dy ffôn di?

Could I use your phone?

A1

Ydy Mary yn defnyddio arogldarth?

Does Mary use incense?

B1

Maen nhw'n hoffi defnyddio arogldarth.

They like using incense.

B1

Ac rwyf wedi siarad â phobl sydd wedi defnyddio'r cynllun, ac maent wedi ei ganmol i'r cymylau, a chredaf fod hynny'n wirioneddol braf ei weld.

And I have spoken to people who have used the scheme, and they’ve been glowing about that, and I think it’s really, really pleasing to see.

C1

Further reading

Welsh Verb Conjugation — All Tenses, Full Tables, Clear Patterns →The Welsh Verb Bod (To Be) — Every Form, Every Tense →Welsh Pronunciation — It's Actually Easier Than English →Best Apps to Learn Welsh (2026) →Browse all Welsh verb conjugations →

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Other Welsh verbs

euro

to gild

uno

to join

duo

to become black

mela

to gather nectar to make honey

dal

to catch

trio

to try

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