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affeithio

to affect

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

Present

Presennol

PersonForm
I (fi)affeithiaf
You sg. (ti)affeithi
He/She (fe/hi)affeithia
We (ni)affeithiwn
You pl. (chi)affeithiwch
They (nhw)affeithiant
Impersonalaffeithir

Imperfect

Amherffaith

PersonForm
I (fi)affeithiwn
You sg. (ti)affeithit
He/She (fe/hi)affeithiai
We (ni)affeithiem
You pl. (chi)affeithiech
They (nhw)affeithient
Impersonalaffeithid

Preterite

Gorffennol

PersonForm
I (fi)affeithiais
You sg. (ti)affeithiaist
He/She (fe/hi)affeithiodd
We (ni)affeithiasom
You pl. (chi)affeithiasoch
They (nhw)affeithiasant
Impersonalaffeithiwyd

Pluperfect

Gorberffaith

PersonForm
I (fi)affeithiaswn
You sg. (ti)affeithiasit
He/She (fe/hi)affeithiasai
We (ni)affeithiasem
You pl. (chi)affeithiasech
They (nhw)affeithiasent
Impersonalaffeithiasid

Future

Dyfodol

PersonForm
I (fi)affeithia i
You sg. (ti)affeithi di
He/She (fe/hi)hi o
We (ni)affeithiwn ni
You pl. (chi)affeithiwch chi
They (nhw)affeithian nhw

Conditional

Amodol

PersonForm
I (fi)affeithiwn
You sg. (ti)affeithit
He/She (fe/hi)hi
We (ni)affeithiem
You pl. (chi)affeithiech
They (nhw)affeithient
Impersonalaffeithid

Imperative

Gorchmynnol

PersonForm
I (fi)-
You sg. (ti)affeithia
He/She (fe/hi)affeithied
We (ni)affeithiwn
You pl. (chi)affeithiwch
They (nhw)affeithient
Impersonalaffeithier

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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