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effeithio

to have an effect

"effeithio" means "to have an effect" in Welsh. Full conjugation table with present, imperfect, preterite, future, conditional, and imperative tenses.

Present

Presennol

PersonForm
I (fi)effeithiaf
You sg. (ti)effeithi
He/She (fe/hi)effeithia
We (ni)effeithiwn
You pl. (chi)effeithiwch
They (nhw)effeithiant
Impersonaleffeithir

Imperfect

Amherffaith

PersonForm
I (fi)effeithiwn
You sg. (ti)effeithit
He/She (fe/hi)effeithiai
We (ni)effeithiem
You pl. (chi)effeithiech
They (nhw)effeithient
Impersonaleffeithid

Preterite

Gorffennol

PersonForm
I (fi)effeithiais
You sg. (ti)effeithiaist
He/She (fe/hi)effeithiodd
We (ni)effeithiasom
You pl. (chi)effeithiasoch
They (nhw)effeithiasant
Impersonaleffeithiwyd

Pluperfect

Gorberffaith

PersonForm
I (fi)effeithiaswn
You sg. (ti)effeithiasit
He/She (fe/hi)effeithiasai
We (ni)effeithiasem
You pl. (chi)effeithiasech
They (nhw)effeithiasent
Impersonaleffeithiasid

Future

Dyfodol

PersonForm
I (fi)effeithia i
You sg. (ti)effeithi di
He/She (fe/hi)hi o
We (ni)effeithiwn ni
You pl. (chi)effeithiwch chi
They (nhw)effeithian nhw

Conditional

Amodol

PersonForm
I (fi)effeithiwn
You sg. (ti)effeithit
He/She (fe/hi)effeithiai
We (ni)effeithiem
You pl. (chi)effeithiech
They (nhw)effeithient
Impersonaleffeithid

Imperative

Gorchmynnol

PersonForm
I (fi)-
You sg. (ti)effeithia
He/She (fe/hi)effeithied
We (ni)effeithiwn
You pl. (chi)effeithiwch
They (nhw)effeithient
Impersonaleffeithier

Example sentences

Pa gyngor ffurfiol sydd wedi cael ei roi iddyn nhw o ran lefel setliad tebygol, er mwyn iddyn nhw allu mynd ati i wneud penderfyniadau fydd yn effeithio ar wasanaethau rheng flaen?

What formal advice has been provided to them in terms of the likely settlement level so that they can start to make decisions that will have an impact on front-line services?

C1

Mae hyn yn amlwg yn straen enfawr ar gyllidebau cynghorau ac yn ei dro, fe fydd yn effeithio'n sylweddol ar wasanaethau lleol.

This clearly is a huge strain on council budgets and, in turn, will drastically affect local services.

B2

Nawr, rwy'n deall bod prosiect Ysgol Bro Ogwr wedi cael ei ohirio oherwydd materion ecolegol sy'n effeithio ar safle Ffordd Cadfan, ac mae hynny wedi arwain at oedi gydag archwilio'r safle.

Now, I understand that the Ysgol Bro Ogwr project has been delayed due to ecological issues affecting the Ffordd Cadfan site, and that's resulted in a delay with site investigation.

C1

Mae'r grŵp yn cynnwys y tri awdurdod lleol nad oes ganddynt ysgol, ond hefyd yr awdurdodau lleol—Casnewydd, Torfaen, Rhondda Cynon Taf, a Phowys—y gallai hynny effeithio arnynt hefyd.

The group consists of the three local authorities that don’t have a school, but also the local authorities—Newport, Torfaen, Rhondda Cynon Taf, and Powys—that might be affected by that, as well.

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

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to gild

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to join

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to become black

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dal

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trio

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