Noun Clauses with *Go* in Irish

In Brief

Use go to introduce a positive “that”-clause and nach to introduce a negative one: Ceapaim go bhfuil sé ceart (“I think that he is right”) and Ceapaim nach bhfuil sé ceart (“I think that he is not right”). These particles normally take a dependent verb form and cause eclipsis; when referring to a completed past event, the corresponding particles are usually gur and nár.

Overview

A noun clause is a clause—a group of words containing a verb—that occupies a slot normally filled by a thing or fact. In “I know that Síle is ill,” the entire bold part is what the speaker knows. Irish uses such clauses constantly after expressions of saying, thinking, knowing, believing, noticing, hearing, hoping, and certainty.

At B1, this pattern lets you join short statements into more natural speech. Instead of stopping at Tá sí tinn (“She is ill”), you can say Tá a fhios agam go bhfuil sí tinn (“I know that she is ill”). The clause introduced by go supplies the content of the knowledge.

English-speaking learners need to watch two differences. First, English can omit “that” in “I think he is right”; standard Irish normally retains go or nach. Second, the verb after the particle is often not the form seen in an independent statement. Irish uses a dependent form (a verb form required after certain small grammatical words), and the particle may trigger eclipsis (urú: a sound and spelling change at the start of a word).

How It Works

The core positive and negative patterns

The main sentence comes first; the noun clause gives the thought, statement, or fact.

Meaning	Pattern	Example
positive	main expression + go + dependent clause	Creidim go dtiocfaidh sí. — I believe that she will come.
negative	main expression + nach + dependent clause	Creidim nach dtiocfaidh sí. — I believe that she will not come.

The negative belongs inside the noun clause. Compare:

• Ní chreidim go dtiocfaidh sí. — I do not believe that she will come.
• Creidim nach dtiocfaidh sí. — I believe that she will not come.

These can suggest similar situations, but their grammar and emphasis differ. In the first, creidim is negated. In the second, the proposition “she will come” is negated.

Eclipsis after go and nach

With most present, future, conditional, and habitual forms, go and nach cause eclipsis. In spelling, the new consonant is written before the original one; the new consonant is normally pronounced.

Initial	After go/nach	Example
b	mb	go mbíonn — that … usually is
c	gc	go gceapann — that … thinks
d	nd	go ndéanfaidh — that … will do
f	bhf	go bhfágfaidh — that … will leave
g	ng	go nglacann — that … accepts
p	bp	go bpósfaidh — that … will marry
t	dt	go dtiocfaidh — that … will come
vowel	n- after go	go n-oibríonn — that … works

Letters that cannot be eclipsed remain unchanged: go léann sé, go scríobhfaidh sí. With a vowel, affirmative go adds n-, but negative nach does not: go n-ólann sé but nach ólann sé.

Do not choose the mutation from the English translation. Choose it from the Irish particle and the initial letter of the Irish verb.

Special dependent forms

Several common irregular verbs use a distinct form after go and nach. These are best learned as complete chunks.

Independent statement	After go	After nach	Meaning
tá	go bhfuil	nach bhfuil	is/are
chuaigh	go ndeachaigh	nach ndeachaigh	went
gheobhaidh	go bhfaighidh	nach bhfaighidh	will get
déanfaidh	go ndéanfaidh	nach ndéanfaidh	will do
tiocfaidh	go dtiocfaidh	nach dtiocfaidh	will come

This explains why go tá is not acceptable in this construction. Tá changes to its dependent form fuil, with eclipsis: go bhfuil.

Completed past events: gur and nár

For an ordinary positive or negative statement about a completed past event, use gur and nár rather than go and nach. They generally cause lenition (séimhiú, usually shown by adding h) where the initial consonant allows it.

Clause type	Particle	Example
positive completed past	gur	Chuala mé gur cheannaigh sí carr. — I heard that she bought a car.
negative completed past	nár	Dúirt sé nár thuig sé an cheist. — He said that he did not understand the question.
irregular dependent past	go/nach in established forms	Sílim go ndeachaigh siad abhaile. — I think that they went home.

The last row matters: irregular verbs may retain their special dependent pattern, as in go ndeachaigh, rather than following a simple “all past clauses take gur” shortcut. Learn frequent combinations from real examples: go raibh, go ndeachaigh, go bhfaca, go bhfuair, alongside regular gur cheannaigh and nár dhún.

The verb bí: go bhfuil and go raibh

The most frequent forms deserve their own mini-paradigm.

Time	Positive	Negative	Example
present	go bhfuil	nach bhfuil	Tá a fhios agam go bhfuil sí anseo.
past	go raibh	nach raibh	Dúirt sé nach raibh sé ag teacht.
future	go mbeidh	nach mbeidh	Tá súil agam go mbeidh tú ann.
conditional	go mbeadh	nach mbeadh	Shíl mé go mbeadh sé níos éasca.

English “was” can describe either a completed state or background information, but Irish raibh is the normal dependent past form of bí. Therefore say Dúirt sí go raibh sí tuirseach, not Dúirt sí gur bhí sí tuirseach.

The copula: gur, nach, gurbh, and nárbh

The copula is the small linking element used to identify or classify someone or something, as in Is múinteoir í (“She is a teacher”). In an affirmative noun clause, it commonly appears through gur:

• Ceapaim gur múinteoir í. — I think that she is a teacher.
• Tá a fhios agam gurb é seo an teach ceart. — I know that this is the right house.

The negative uses nach:

• Ceapaim nach múinteoir í. — I think that she is not a teacher.

In past or conditional copular contexts, especially before a vowel or pronoun, you will also meet gurbh and nárbh:

• Shíl mé gurbh é Seán an bainisteoir. — I thought that Seán was the manager.
• Dúirt sí nárbh fhadhb mhór é. — She said that it was not a major problem.

Do not put go bhfuil before a noun merely because English uses “is.” Tá/níl describes states and locations; the copula identifies or classifies. Compare Ceapaim go bhfuil sí sásta (“I think she is happy”) with Ceapaim gur dochtúir í (“I think she is a doctor”).

Common expressions that take a noun clause

Expression	Meaning	Typical continuation
Ceapaim…	I think…	go/nach…
Creidim…	I believe…	go/nach…
Tá a fhios agam…	I know…	go/nach…
Dúirt sé/sí…	he/she said…	go/nach, gur/nár…
Chuala mé…	I heard…	a clause containing what was heard
Is dóigh liom…	I think/suppose…	go/nach…
Tá súil agam…	I hope…	often a future clause
Is léir…	it is clear…	go/nach…

Examples in Context

Irish	English	Note
Ceapaim go bhfuil sé ceart.	I think that he is right.	Present dependent form of bí.
Tá a fhios agam go bhfuil sí tinn.	I know that she is ill.	A fact introduced by go.
Dúirt sé nach raibh sé ag teacht.	He said that he was not coming.	Negative dependent past of bí.
Creidim go dtiocfaidh siad amárach.	I believe that they will come tomorrow.	t is eclipsed by d.
Tá súil agam nach mbeidh sé ag cur báistí.	I hope that it will not be raining.	Negative future of bí.
Is dóigh liom go n-oibríonn Aoife sa bhaile.	I think Aoife works from home.	n- before a vowel after go.
Sílim nach ólann sé caife.	I think that he does not drink coffee.	No n- after nach before a vowel.
Chuala mé gur cheannaigh siad teach nua.	I heard that they bought a new house.	Regular completed past with gur.
Dúirt Máire nár fhág sí an eochair ansin.	Máire said that she did not leave the key there.	Negative completed past with nár.
Sílim go ndeachaigh Cian abhaile go luath.	I think Cian went home early.	Dependent past of téigh.
Ceapaim gur altra í.	I think that she is a nurse.	Classification with the copula.
Shíl mé gurbh é sin an freagra ceart.	I thought that that was the right answer.	Past copular context.
Ní chreidim go ndéanfaidh sé dearmad.	I do not believe that he will forget.	The main verb, not the noun clause, is negative.
Creidim nach ndéanfaidh sé dearmad.	I believe that he will not forget.	Negation lies inside the noun clause.

Common Mistakes

Dropping go as English drops “that”

• Wrong: Ceapaim tá sé ceart.
• Right: Ceapaim go bhfuil sé ceart.
• Why: English can say “I think he is right,” but Irish normally needs the connecting particle and the dependent form.

Using tá after go

• Wrong: Tá a fhios agam go tá sí anseo.
• Right: Tá a fhios agam go bhfuil sí anseo.
• Why: Bí has the special dependent present form fuil, producing go bhfuil.

Treating every English “is” as bí

• Wrong: Ceapaim go bhfuil sí dochtúir.
• Right: Ceapaim gur dochtúir í.
• Why: A profession classifies a person, so Irish uses the copula rather than tá.

Putting the negative in the wrong clause

• Wrong for “I think he is not coming”: Ní cheapaim go bhfuil sé ag teacht.
• Right: Ceapaim nach bhfuil sé ag teacht.
• Why: The intended negative is “he is not coming,” so nach belongs inside the content clause. The first sentence instead negates “I think.”

Adding the wrong mutation

• Wrong: Creidim go tiocfaidh sí.
• Right: Creidim go dtiocfaidh sí.
• Why: Go causes eclipsis here, so t becomes dt.

Applying one past-tense rule mechanically

• Wrong: Dúirt sé gur bhí sé tuirseach.
• Right: Dúirt sé go raibh sé tuirseach.
• Why: Raibh is the dependent past form of bí. Past clauses require attention to the particular verb, not just substitution of gur for go.

Usage Notes

In everyday Irish, go bhfuil, nach bhfuil, go raibh, and nach raibh are exceptionally frequent. Learning them as whole sound units is more useful than rebuilding them letter by letter each time. The same applies to go mbeidh, go mbeadh, and go dtiocfaidh.

Irish generally states the connector where conversational English might omit “that.” Keeping go/nach also signals immediately that the following words are subordinate—that is, grammatically attached to the main clause. In fast speech the particle may be unstressed, but that is not a reason to omit it in careful writing.

The tense is chosen for the meaning of the embedded event, not simply copied from the first verb. Deir sí go bhfuil sí gnóthach means “She says she is busy”; Dúirt sí go raibh sí gnóthach means “She said she was busy.” Irish reported speech has further tense choices, but the central noun-clause machinery remains the same.

Beyond the Basics / Advanced Use

Noun clauses and reported speech

A noun clause merely packages a proposition as the content of thinking, knowing, or saying. Full reported speech goes further: it asks how tense, time words, person, questions, and commands change when someone’s original words are retold. For example:

• Direct words: “Beidh mé ann amárach.” — “I will be there tomorrow.”
• Report: Dúirt sí go mbeadh sí ann an lá dár gcionn. — She said that she would be there the following day.

The conditional mbeadh presents the future from a past viewpoint. At B1, first master the connector and dependent form; at B2, study when such backshifting is natural or required.

A noun clause can fill several roles

Most examples above place the clause after a verb, where it supplies what is thought, known, or said. It can also complete an impersonal expression:

• Is léir go bhfuil fadhb ann. — It is clear that there is a problem.
• Is dócha nach dtiocfaidh siad. — They probably will not come.
• B’fhéidir go mbeidh sí déanach. — Perhaps she will be late.

Grammatically, the clause still names a fact or possibility. This is why the same go/nach pattern appears even when there is no English verb such as “think” immediately before it.

Do not confuse noun clauses with relative clauses

Both clause types connect ideas, but they do different jobs:

• an fear a chónaíonn anseo — the man who lives here: the relative clause describes an fear.
• Tá a fhios agam go gcónaíonn sé anseo — I know that he lives here: the noun clause gives what I know.

The direct relative particle a commonly causes lenition, while noun-clause go/nach commonly causes eclipsis. Identifying the clause’s job is therefore more reliable than translating every connector as English “that.”

Subjunctive wishes also use go

You will encounter go in wishes such as Go n-éirí leat! (“May you succeed!”). This contains a present subjunctive form—a special verb form associated here with a wish—not an ordinary factual noun clause after “think” or “know.” The spelling and mutation may look familiar, but the function is different.

Practice Tips

1. Build four-form chains. Start with one idea and change only the time or polarity: go bhfuil / nach bhfuil / go raibh / nach raibh. Then do the same with go mbeidh / nach mbeidh / go mbeadh / nach mbeadh.
2. Transform real statements. Take Tiocfaidh Nóra amárach and place it after Ceapaim: Ceapaim go dtiocfaidh Nóra amárach. Then negate the embedded clause: Ceapaim nach dtiocfaidh Nóra amárach.
3. Record chunks, not isolated particles. In listening or reading, collect complete combinations such as gur cheannaigh, nár thuig, go ndeachaigh, and gur múinteoir í. Say each in a full sentence so that the mutation becomes automatic.

Related Concepts

• Prerequisite: Basic Relative Clauses — compare clauses that describe a noun with clauses that express a whole fact.
• Next step: Purpose and Result — uses subordinate clauses to express aims and consequences.
• Next step: Reported Speech — develops these noun clauses with viewpoint and tense changes.
• Further study: Cause, Purpose, and Concessive Clauses — expands your range of clause connectors and logical relationships.