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trethu

to tax

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

Present

Presennol

PersonForm
I (fi)trethaf
You sg. (ti)trethi
He/She (fe/hi)treth
We (ni)trethwn
You pl. (chi)trethwch
They (nhw)trethant
Impersonaltrethir

Imperfect

Amherffaith

PersonForm
I (fi)trethwn
You sg. (ti)trethit
He/She (fe/hi)trethai
We (ni)trethem
You pl. (chi)trethech
They (nhw)trethent
Impersonaltrethid

Preterite

Gorffennol

PersonForm
I (fi)trethais
You sg. (ti)trethaist
He/She (fe/hi)hi
We (ni)trethasom
You pl. (chi)trethasoch
They (nhw)trethasant
Impersonaltrethwyd

Pluperfect

Gorberffaith

PersonForm
I (fi)trethaswn
You sg. (ti)trethasit
He/She (fe/hi)trethasai
We (ni)trethasem
You pl. (chi)trethasech
They (nhw)trethasent
Impersonaltrethasid

Future

Dyfodol

PersonForm
I (fi)tretha i
You sg. (ti)trethi di
He/She (fe/hi)hi o
We (ni)trethwn ni
You pl. (chi)trethwch chi
They (nhw)trethan nhw

Conditional

Amodol

PersonForm
I (fi)trethwn
You sg. (ti)trethit
He/She (fe/hi)hi
We (ni)trethem
You pl. (chi)trethech
They (nhw)trethent
Impersonaltrethid

Imperative

Gorchmynnol

PersonForm
I (fi)-
You sg. (ti)treth
He/She (fe/hi)trethed
We (ni)trethwn
You pl. (chi)trethwch
They (nhw)trethent
Impersonaltrether

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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