Preverbal Particles

A Preverbal Particle always precedes a conjugated form of the verb and must be translated as part of that verb.
Most Preverbal Particles have one form that precedes verbs in the present, future, conditional, or imperfect, and another form that precedes verbs in the past tense only. This division of tenses and moods holds true for regular and irregular verbs, with one exception: the dependent past tense forms of , téigh, déan, and feic are preceded by the Preverbal Particles that precede the present, future, conditional, and imperfect, i.e. ní raibh, an ndeachaigh, go ndearna, nach bhfaca, etc. rather than níor raibh, ar dheachaigh, gur dhearna, nár fhaca, etc.
The Copula is never preceded by a Preverbal Particle because the information conveyed by Preverbal Particles is already contained in special forms of the Copula (see The Copula: Forms).

I. The Perfective Preverbal Particle

The Perfective Preverbal Particle doL indicates that a following verb is in the past tense. DoL used to be written in front of every past-tense verb, including those with initial consonants, but Caighdeán spelling omits doL unless a following verb begins with a vowel or with ‘f + Vowel’, in which case doL appears as dL’.
2nd Sg. Imperative
Old Spelling
Caighdeán Spelling
cuir ‘put’
do chuir sí
chuir sí
ól ‘drink’
d’ól sí
d’ól sí
fág ‘leave’
d’fhág sí
d’fhág sí
scríobh ‘write’
do scríobh sí
scríobh sí
déan ‘do’
do rinne sí
rinne sí
faigh ‘get’
do fuair10
fuair sí

II. Negative and/or Interrogative Preverbal Particles

A Negative Preverbal Particle indicates that the verb should be translated with the word ‘not’ (e.g. ní raibh ‘he was not’).
An Interrogative Preverbal Particle indicates that the verb should be translated as the beginning of a question (e.g. an raibh sé?was he?’).
A Negative Interrogative Preverbal Particle indicates that the verb should be translated with the word ‘not’ at the beginning of a question (nach raibh sé?wasn’t he?’).
 
All Tenses and Moods
except the Past
Past Tense
only
Negative
L
níorL
Interrogative
anE
arL
Negative
nachE
nárL
Interrogative ‘where?’
E
cárL
Note: If an Irregular Verb has dependent past-tense forms, they follow , an, nach, and ; níor, ar, nár, and cár are not used. Fuair ‘got’ and dúirt ‘said’ also follow , an, nach, and , and again, níor, ar, nár, and cár are not used. There is one final surprise: eclipses fuair, faighidh, and faigheadh.
Examples of Negative and/or Interrogative Preverbal Particles:
Níl11 sé inár measc.
‘He is not among us.’
Ní dheachaigh siad ar scoil.
‘They did not go to school.’
Níor imigh mé aréir.
‘I didn’t depart last night.’
An íosfá12 uibheacha uaine agus liamhás?
Would you eat green eggs and ham?’
An bhfacanach bhfaca tú muid?
Did you or didn’t you see us?’
Ar cheannaighnár cheannaigh sibh iad?
Did you or didn’t you buy them?’
Cá n-imríodh sibh peil?
Where used you to play football [soccer]?’
Cár fhoghlaim Bairbre Gaeilge?
Where did Bairbre learn Irish?’

III. Preverbal Particles for Commanding or Wishing

h indicates a negative command. It may precede the imperative mood in any person or number.
GoE indicates a positive wish. It may precede the present subjunctive in any person or number.
NárL indicates a negative wish. It may precede the present subjunctive in any person or number.
Examples of Preverbal Particles in Commands or Wishes:
Ná habair é!
Don’t say/mention it!’
Go maire na mná go deo!
May the women live forever!’
Nár aithní an diabhal tú!
May the Devil not recognize you!’
Images Go maire na mná go deo! is a drinking-toast. A fuller version is Sláinte na bhfear agus go maire na mná go deo! ‘[I propose] the men’s health and may the women live forever!’ Nár aithní an diabhal tú! is a humorous blessing, implying as it does that the addressee might well deserve to be recognized by the Devil.