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To begin in Irish (tosaigh): Meaning, Conjugation, Examples

Other uses of ‘tosaigh’: start

The Irish for to begin is tosaigh; ag tosú is beginning.
Updated October 2026Report a mistake

How to say “to begin” in Irish

Irish:
tosaigh
English:
to begin, start
Word type:
verb, second-conjugation
Verbal noun:
tosú (ag tosú, beginning)
Verbal adjective:
tosaithe
Pronunciation:
“TUS-ee”  /ˈt̪ˠɔsˠə/

What does “tosaigh” mean?

“Tosaigh” has two alternative meanings. The most common comes first.

to begin
To start doing something or to come into being.Also: start, commence.
1 other meaning: start
2to start
To set something going, such as a process, a job or a machine.Also: initiate, launch, set going.

“Tosaigh” in the different tenses

Every form follows An Caighdeán Oifigiúil.

Aimsir Chaite (Past)

PersonPositiveNegativeQuestion
mé (I)Thosaigh méI beganNíor thosaigh méI did not beginAr thosaigh mé?Did I begin?
tú (you)Thosaigh túYou beganNíor thosaigh túYou did not beginAr thosaigh tú?Did you begin?
sé / sí (he / she)Thosaigh sé / síHe beganNíor thosaigh sé / síHe did not beginAr thosaigh sé / sí?Did he begin?
sinn (we)ThosaíomarWe beganNíor thosaíomarWe did not beginAr thosaíomar?Did we begin?
sibh (you, plural)Thosaigh sibhYou beganNíor thosaigh sibhYou did not beginAr thosaigh sibh?Did you begin?
siad (they)Thosaigh siadThey beganNíor thosaigh siadThey did not beginAr thosaigh siad?Did they begin?
saorbhriathar (autonomous)TosaíodhNíor tosaíodhAr tosaíodh?

Aimsir Láithreach (Present)

PersonPositiveNegativeQuestion
mé (I)TosaímI beginNí thosaímI do not beginAn dtosaím?Do I begin?
tú (you)Tosaíonn túYou beginNí thosaíonn túYou do not beginAn dtosaíonn tú?Do you begin?
sé / sí (he / she)Tosaíonn sé / síHe beginsNí thosaíonn sé / síHe does not beginAn dtosaíonn sé / sí?Does he begin?
sinn (we)TosaímidWe beginNí thosaímidWe do not beginAn dtosaímid?Do we begin?
sibh (you, plural)Tosaíonn sibhYou beginNí thosaíonn sibhYou do not beginAn dtosaíonn sibh?Do you begin?
siad (they)Tosaíonn siadThey beginNí thosaíonn siadThey do not beginAn dtosaíonn siad?Do they begin?
saorbhriathar (autonomous)TosaítearNí thosaítearAn dtosaítear?

Aimsir Fháistineach (Future)

PersonPositiveNegativeQuestion
mé (I)Tosóidh méI will beginNí thosóidh méI will not beginAn dtosóidh mé?Will I begin?
tú (you)Tosóidh túYou will beginNí thosóidh túYou will not beginAn dtosóidh tú?Will you begin?
sé / sí (he / she)Tosóidh sé / síHe will beginNí thosóidh sé / síHe will not beginAn dtosóidh sé / sí?Will he begin?
sinn (we)TosóimidWe will beginNí thosóimidWe will not beginAn dtosóimid?Will we begin?
sibh (you, plural)Tosóidh sibhYou will beginNí thosóidh sibhYou will not beginAn dtosóidh sibh?Will you begin?
siad (they)Tosóidh siadThey will beginNí thosóidh siadThey will not beginAn dtosóidh siad?Will they begin?
saorbhriathar (autonomous)TosófarNí thosófarAn dtosófar?

Modh Coinníollach (Conditional)

PersonPositiveNegativeQuestion
mé (I)ThosóinnI would beginNí thosóinnI would not beginAn dtosóinn?Would I begin?
tú (you)ThosófáYou would beginNí thosófáYou would not beginAn dtosófá?Would you begin?
sé / sí (he / she)Thosódh sé / síHe would beginNí thosódh sé / síHe would not beginAn dtosódh sé / sí?Would he begin?
sinn (we)ThosóimisWe would beginNí thosóimisWe would not beginAn dtosóimis?Would we begin?
sibh (you, plural)Thosódh sibhYou would beginNí thosódh sibhYou would not beginAn dtosódh sibh?Would you begin?
siad (they)ThosóidísThey would beginNí thosóidísThey would not beginAn dtosóidís?Would they begin?
saorbhriathar (autonomous)ThosófaíNí thosófaíAn dtosófaí?

“Tosaigh” in a sentence: Irish examples

Past, present, future and conditional, with a negative and a question.

Thosaigh an scannán ar a hocht a chlog.
The film started at eight o'clock.
Tosaíonn an scoil ar an Luan.
School starts on Monday.
Tosóimid ag obair amárach.
We will start working tomorrow.
Thosóinn arís dá mbeadh an t-am agam.
I would start again if I had the time.
Níor thosaigh an cluiche fós.
The match hasn't started yet.
Ar thosaigh tú ar an leabhar nua?
Did you start the new book?

Other verbs in Irish

More everyday Irish verbs to learn next.

To begin in Irish: frequently asked questions

What is the Irish for to begin?

The Irish for to begin is tosaigh (pronounced “TUS-ee”). It is a second-conjugation verb; the verbal noun is tosú.

What is the verbal noun of tosaigh?

The verbal noun of tosaigh is tosú, used after ag for the continuous: ag tosú (beginning). The verbal adjective is tosaithe.

How do you say tosaigh in the past and the future?

Past: Thosaigh mé; negative Níor thosaigh mé; question Ar thosaigh mé?. Future: Tosóidh mé; negative Ní thosóidh mé; question An dtosóidh mé?.

What is the modh coinníollach of tosaigh?

The conditional (modh coinníollach) first person is Thosóinn (I would begin); negative Ní thosóinn; question An dtosóinn?.

Does tosaigh have more than one meaning?

Yes. Tosaigh can mean to begin or to start, depending on context; the first is the most common.

How do I say 'start doing something' with tosaigh?

Use 'ag' with the verbal noun: 'Thosaigh sé ag caoineadh' means 'He started crying'. With a task as object, use 'ar': 'Thosaigh mé ar an obair'.

What is the difference between tosaigh and 'cuir tús le'?

Both mean 'start', but 'cuir tús le' is used for starting something: 'Chuir siad tús leis an gcruinniú'. 'Tosaigh' is more general and can be used alone: 'Thosaigh an cruinniú'.

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