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deddfu

to legislate

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

Present

Presennol

PersonForm
I (fi)deddfaf
You sg. (ti)deddfi
He/She (fe/hi)deddfa
We (ni)deddfwn
You pl. (chi)deddfwch
They (nhw)deddfant
Impersonaldeddfir

Imperfect

Amherffaith

PersonForm
I (fi)deddfwn
You sg. (ti)deddfit
He/She (fe/hi)deddfai
We (ni)deddfem
You pl. (chi)deddfech
They (nhw)deddfent
Impersonaldeddfid

Preterite

Gorffennol

PersonForm
I (fi)deddfais
You sg. (ti)deddfaist
He/She (fe/hi)deddfodd
We (ni)deddfasom
You pl. (chi)deddfasoch
They (nhw)deddfasant
Impersonaldeddfwyd

Pluperfect

Gorberffaith

PersonForm
I (fi)deddfaswn
You sg. (ti)deddfasit
He/She (fe/hi)deddfasai
We (ni)deddfasem
You pl. (chi)deddfasech
They (nhw)deddfasent
Impersonaldeddfasid

Future

Dyfodol

PersonForm
I (fi)deddfa i
You sg. (ti)deddfi di
He/She (fe/hi)hi o
We (ni)deddfwn ni
You pl. (chi)deddfwch chi
They (nhw)deddfan nhw

Conditional

Amodol

PersonForm
I (fi)deddfwn
You sg. (ti)deddfit
He/She (fe/hi)hi
We (ni)deddfem
You pl. (chi)deddfech
They (nhw)deddfent
Impersonaldeddfid

Imperative

Gorchmynnol

PersonForm
I (fi)-
You sg. (ti)deddfa
He/She (fe/hi)deddfed
We (ni)deddfwn
You pl. (chi)deddfwch
They (nhw)deddfent
Impersonaldeddfer

Example sentences

Rydych chi'n deddfu ar fysiau ac rydych chi'n gwneud dim am drafnidiaeth ysgol.

You're legislating on buses and you're doing nothing about school transport.

B2

Hynny yw, mae angen deddfu.

In other words, we need to legislate.

A2

Byddai'r gwelliant yn gofyn bod canllawiau ar waith cyn deddfu, ond mae'r deddfu yn digwydd ar adeg cael Cydsyniad Brenhinol.

The amendment would require guidance to be in place before enactment, but enactment occurs on Royal Assent.

C2

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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