Demonstratives in Irish

In Brief

Irish uses seo for “this/these,” sin for “that/those,” and siúd for something more distant: “that/those over there.” After a noun, the pointing word comes last and the noun normally has the definite article: an leabhar seo (“this book”), an teach sin (“that house”), na tithe siúd (“those houses over there”). The forms do not change for singular and plural.

Overview

A demonstrative is a pointing word: a word such as “this” or “that” that identifies which person or thing you mean. Irish demonstratives are simple in one respect: there is no separate pair like English “this/these” or “that/those.” Seo, sin, and siúd can all refer to either one item or several. The surrounding words and the situation show the number.

The main adjustment for an English-speaking learner is word order. English puts the demonstrative before a noun: “this book.” Irish normally builds a definite noun phrase (a group of words centred on a noun) and puts the demonstrative after it: an leabhar seo, literally “the book this.” The article an (“the,” singular) or na (“the,” plural) remains present.

This is an A1 pattern used constantly when identifying people, asking about unfamiliar objects, shopping, choosing between alternatives, and referring back to something in a conversation. Learn seo and sin first. Siúd adds a useful three-way distance contrast, but you do not need to force it into every situation where English uses “that.”

How It Works

The three pointing forms

Irish	Core meaning	Typical use
seo	this; these	near the speaker, current, or immediately present
sin	that; those	farther away, already indicated, or contrasted with seo
siúd	that; those over there	noticeably remote or deliberately pointed out at a distance

These meanings describe the basic physical contrast, but demonstratives also work in conversation. Seo can introduce what is here or what is about to be presented; sin can refer back to what another person has just said; siúd can single out a distant person or object.

With a noun: article + noun + demonstrative

The basic beginner pattern is:

an/na + noun (and any description) + seo/sin/siúd

Number	Irish pattern	Example	Meaning
Singular	an + noun + seo	an leabhar seo	this book
Singular	an + noun + sin	an teach sin	that house
Plural	na + noun + seo	na leabhair seo	these books
Plural	na + noun + sin	na tithe sin	those houses

The demonstrative closes the whole noun phrase. If the noun has an adjective (a describing word), the adjective normally stays with the noun and the demonstrative comes afterward:

• an carr dearg seo — this red car
• an teach mór sin — that big house
• na leabhair nua seo — these new books

The article may alter the beginning of an Irish noun according to the ordinary article rules. The demonstrative does not cancel those changes: an bhean seo (“this woman”), an t-uisce seo (“this water”), na fuinneoga sin (“those windows”). It is best to treat the article and noun as an established unit, then add the pointing word at the end.

English “this” can act like an article, but Irish seo cannot simply be placed before a bare noun. For an ordinary specific phrase, say an leabhar seo, not seo leabhar and not normally leabhar seo.

Singular and plural come from the noun phrase

The demonstrative itself stays unchanged. Compare:

• an duine seo — this person
• na daoine seo — these people
• an cathaoir sin — that chair
• na cathaoireacha sin — those chairs

Number is shown by an/na and by the noun, not by changing seo to another form. This makes the Irish inventory smaller than the English one.

Used without a following noun

The same forms can point independently, rather like English “this” and “that” used on their own:

• Cad é seo? — What is this?
• Cad é sin? — What is that?
• Cé hé siúd? — Who is that man/person over there?
• Is maith liom seo. — I like this.

In identification sentences, Irish often combines the demonstrative with a pronoun that matches the person or thing being identified:

• Seo é an leabhar. — This is the book.
• Seo í Máire. — This is Máire.
• Sin iad na heochracha. — Those are the keys.

Here é is masculine singular, í feminine singular, and iad plural. At beginner level, learn these as useful identification frames rather than trying to translate every word separately. A person’s grammatical gender and the noun’s gender determine é or í; plural referents use iad.

“This one” and “that one”: an ceann seo/sin

English often leaves out a repeated noun: “I prefer the blue shirt, not that one.” Irish commonly uses ceann, literally “head,” as a substitute meaning “one.” Its plural is cinn.

Irish	English
an ceann seo	this one
an ceann sin	that one
na cinn seo	these ones / these
na cinn sin	those ones / those

Because ceann is still a noun, the familiar pattern remains: article + noun + demonstrative. A description can go between them: an ceann gorm sin (“that blue one”).

Examples in Context

Irish	English	Note
An leabhar seo atá uaim.	I want this book.	Seo follows the complete noun phrase.
Tá an teach sin an-sean.	That house is very old.	Sin points to a particular house.
Tá na bróga seo compordach.	These shoes are comfortable.	Seo is unchanged in the plural.
Tá na páistí sin sa ghairdín.	Those children are in the garden.	Na páistí marks the plural.
Féach ar an gcrann siúd.	Look at that tree over there.	Siúd emphasizes distance.
Is liomsa an mála dubh seo.	This black bag is mine.	The adjective comes before seo.
Cad é seo?	What is this?	Seo stands independently.
Cad é sin ar an mbord?	What is that on the table?	A natural question about an object.
Seo é an leabhar atá uait.	This is the book you want.	Identification with é.
Seo í mo dheirfiúr, Nóra.	This is my sister, Nóra.	Identification with feminine í.
Sin iad na heochracha.	Those are the keys.	Plural identification uses iad.
Is maith liom an ceann sin.	I like that one.	Ceann replaces a repeated singular noun.
Ba mhaith liom na cinn seo, le do thoil.	I would like these ones, please.	Useful when choosing several items.
Cé hé an fear siúd?	Who is that man over there?	A distant male person.

Common Mistakes

Putting the demonstrative before the noun

• Wrong: seo leabhar
• Right: an leabhar seo
• Why: Irish normally puts the demonstrative after the noun phrase, unlike English.

Dropping the definite article

• Wrong: leabhar sin for “that book”
• Right: an leabhar sin
• Why: A noun modified by seo, sin, or siúd normally forms a definite phrase and includes an or na.

Inventing separate plural demonstratives

• Wrong idea: trying to find a special Irish equivalent of English “these” before using a plural noun
• Right: an leabhar seo / na leabhair seo
• Why: Seo means both “this” and “these.” The article and noun show whether the phrase is singular or plural.

Putting an adjective after the demonstrative

• Wrong: an carr seo dearg
• Right: an carr dearg seo
• Why: The demonstrative normally comes at the end of the whole noun phrase; the adjective stays beside the noun it describes.

Using siúd for every English “that”

• Awkward as a default: an cupán siúd when you merely mean a nearby cup already indicated
• Natural default: an cupán sin
• Why: Siúd makes remoteness more explicit. Sin is the broad everyday choice for “that/those”; use siúd when “over there” matters.

Forgetting ordinary article mutations

• Wrong: an bean seo
• Right: an bhean seo
• Why: Adding a demonstrative does not remove the sound and spelling changes caused by the definite article. Review the article pattern separately.

Usage Notes

Physical and conversational distance

Distance is not measured mechanically. Seo often presents something as close to the speaker or central right now. Sin may point to a physically farther object, but it can also refer to an idea just mentioned: Tá sin ceart (“That is right”). In that sentence, nothing physical is being pointed at.

Siúd is more strongly distal—that is, it points away from the speaker. It is useful while indicating someone across a room or an object in the distance. Context, gesture, and what has already been mentioned all influence the choice.

Seo for presenting something

At the start of an introduction or presentation, seo can mean “here is” or “this is”: Seo í Aoife (“This is Aoife”) and Seo é do chaife (“Here is your coffee”). English changes between “this is” and “here is,” but Irish can use the same presentational form.

Referring to a statement

Independent seo and sin can refer to an event, fact, or whole previous statement, not only to a visible object. Useful short reactions include Tá sin go maith (“That is good”) and Sin é (“That’s it”). In such uses, translating by meaning is more reliable than assigning a concrete object to the demonstrative.

Beyond the Basics / Advanced Use

You do not need to master the following details at A1, but they explain forms you will meet later.

After a noun, úd is also used as a distal demonstrative: an fear úd (“that man over there” or “that particular man”). In many contexts it corresponds to independent siúd. It can sound more pointed or can pick out someone or something already identifiable from context. Usage and preference vary, so at first it is enough to recognize úd and continue producing clear phrases with seo, sin, and siúd.

Demonstratives can also reach beyond literal distance. Writers and speakers use them to organize discourse: seo draws an idea into the current focus, while sin points back to something already said. This is why sin appears in fixed conversational expressions such as Mar sin (“therefore,” literally “like that”) and Sin é (“That’s it”). These expressions should be learned as whole phrases; their meanings are broader than physical pointing.

Possessive phrases already identify a noun, so structures involving possession and demonstratives deserve to be learned from real examples rather than built by replacing an mechanically. For now, the dependable beginner model is the ordinary definite phrase an/na + noun + demonstrative and the independent patterns Cad é seo?, Seo é/í..., and Sin iad....

Practice Tips

1. Practise in contrasting pairs. Put two objects at different distances and say an leabhar seo / an leabhar sin, then repeat with a plural pair: na leabhair seo / na leabhair sin. This trains both word order and number without changing the demonstrative.
2. Label whole chunks, not isolated words. On a flashcard, write an cupán seo, not only seo. Add one adjective later: an cupán gorm seo. This makes the final position feel automatic.
3. Use choice questions. While shopping or looking at pictures, ask An ceann seo nó an ceann sin? (“This one or that one?”). Answer with Ba mhaith liom an ceann sin (“I’d like that one”).

Related Concepts

• Prerequisite: The Definite Article — an and na, including their effects on nouns, are the foundation of demonstrative noun phrases.