Instrumental and Other Cases in Basque

In Brief

Basque often expresses relationships that English shows with separate prepositions by adding a case ending to a noun phrase. Use -z for a means or instrument, -entzat for an intended recipient or beneficiary, -gatik for a reason, and -tzat for a role or classification: autobusez “by bus,” zuretzat “for you,” eurigatik “because of the rain,” and irakasletzat “as a teacher.”

Overview

A case is an ending that shows the job of a noun phrase—the person, thing, or group built around a noun—in a sentence. English normally puts words such as “with,” “for,” “because of,” or “as” before that phrase. Basque usually puts the relevant ending on its final word instead. This is the same broad pattern used by the locative cases in etxean “in the house,” etxera “to the house,” and etxetik “from the house.”

At B1, four endings greatly expand what you can say. The instrumental (instrumentala) -z presents something as the means, material, manner, topic, or route involved. The destinative (destinatiboa) -entzat marks the person or group for whom something is intended. The motivative (motiboa) -gatik gives a cause or reason. The prolative (prolatiboa) -tzat assigns a role, status, or classification.

The challenge for an English-speaking learner is not simply memorising four translations. English “for,” for example, can indicate a recipient, a reason, a duration, or an exchange; Basque does not use -entzat for all of these. Learn each ending together with its meaning and with a few common sentence patterns.

How It Works

The four core contrasts

Ending	Main question	Core meaning	Example
-z	By what means? With what?	instrument, means, manner	trenez “by train”
-entzat	For whom? Intended for whom?	beneficiary or intended recipient	haurrentzat “for the children”
-gatik	Why? Because of whom or what?	cause, reason, motive	lanagatik “because of work”
-tzat	As what? Regarded as what?	role, capacity, classification	laguntzat “as a friend”

The ending belongs to the entire noun phrase and normally appears only once, on its last component:

• nire lagun berriarentzat — “for my new friend”
• eguraldi txarragatik — “because of the bad weather”
• oso irakasle ontzat — “as a very good teacher”

Basque endings can have different surface forms according to whether a noun phrase is singular, plural, definite, or indefinite, and according to the sound before the ending. The forms below are the most useful productive patterns; learning complete phrases is safer than trying to attach the shortest label mechanically.

Instrumental -z: means, instrument, manner, and topic

The central meaning of -z is “by means of” or “using.” Common indefinite forms are -z after a vowel and -ez after a consonant:

• autoz — by car
• eskuz — by hand
• trenez — by train
• autobusez — by bus

Definite phrases commonly show -az in the singular and -ez in the plural:

• liburuaz — with/about the book
• liburuez — with/about the books

Do not reduce the instrumental to English “with.” It covers several related uses:

1. Transport or means: Bizikletaz joan naiz — “I went by bicycle.”
2. Tool or material: Arkatzez idatzi dut — “I wrote it in pencil.”
3. Manner or state: pozez — “with joy”; kontuz — “carefully” (literally, with care).
4. Topic with certain verbs: politikaz hitz egin dugu — “We talked about politics.”
5. Languages or modes of expression: euskaraz — “in Basque”; telefonoz — “by phone.”

English “with” also marks accompaniment: “with Ane” means that Ane comes too, not that she is a tool. Basque normally uses the sociative ending -rekin for accompaniment: Anerekin etorri naiz, “I came with Ane.” Compare labanez moztu dut, “I cut it with a knife,” where the knife is the instrument and -z is appropriate.

Destinative -entzat: intended for someone

Use the destinative when a person, animal, group, or sometimes thing is the intended beneficiary, audience, or destination of something in a figurative sense:

• Hau zuretzat da. — This is for you.
• Haurrentzat liburu bat erosi dut. — I bought a book for the children.
• Hasiberrientzat ikastaroa da. — The course is for beginners.

With ordinary definite noun phrases, forms commonly include -arentzat in the singular and -entzat in the plural:

Base phrase	Destinative	Meaning
laguna	lagunarentzat	for the friend
ikaslea	ikaslearentzat	for the student
lagunak	lagunentzat	for the friends
haurrak	haurrentzat	for the children

Personal pronouns have forms worth learning as whole words:

Person	Form	Meaning
ni	niretzat	for me
zu	zuretzat	for you
hura	harentzat	for him/her/that person
gu	guretzat	for us
zuek	zuentzat	for you (plural)
haiek	haientzat	for them

The destinative does not simply replace every English “for.” A direct recipient with verbs such as “give” is normally marked by the dative case: Aneri liburua eman diot, “I gave the book to Ane.” By contrast, Anerentzat liburua erosi dut means “I bought the book for Ane”—Ane is the intended beneficiary, whether or not she has received it yet.

Motivative -gatik: cause and reason

Use -gatik to answer “why?” or to identify the cause behind an event, feeling, decision, praise, or blame:

• Euriagatik geratu gara etxean. — We stayed home because of the rain.
• Zuregatik etorri naiz. — I came because of you.
• Laguntzagatik eskerrik asko. — Thank you for the help.

Common definite forms include -agatik after a singular noun and -engatik with a plural phrase. Pronouns and possessive-like forms should again be learned whole: nigatik “because of me,” zugatik “because of you,” harengatik “because of him/her,” guregatik “because of us,” and haiengatik “because of them.”

-gatik attaches to a noun phrase. When the reason is a complete event—“because it was raining,” for instance—Basque can instead use a clause with a connector such as -elako: Euria ari zuelako ez gara joan. At B1, a useful contrast is:

• noun reason: euriagatik — because of the rain
• clause reason: euria ari zuelako — because it was raining

Prolative -tzat: role, capacity, and classification

The prolative identifies the role in which someone acts or the category into which someone or something is placed. The noun before it is generally not accompanied by the article -a:

• Irakasletzat lan egiten du. — He/She works as a teacher.
• Laguntzat hartu nuen. — I took him/her to be a friend.
• Adibidetzat erabili dugu. — We used it as an example.

This ending often occurs with verbs meaning “take,” “regard,” “choose,” “appoint,” “use,” or “have”: hartu, jo, aukeratu, izendatu, erabili, and eduki. The exact English translation varies—“as,” “for,” “to be,” or “as a”—but the Basque idea remains classification or assigned function.

Spelling may be visually confusing after a word ending in -t or another consonant, but standard modern spelling normally joins the ending directly: irakasletzat, not irakasle-tzat. A hyphen can be used metalinguistically when discussing the ending -tzat itself, but it is not normally inserted inside the inflected word.

Examples in Context

Basque	English	Note
Autobusez etorri naiz.	I came by bus.	Means of transport: -z
Txostena eskuz idatzi zuen.	He/She wrote the report by hand.	Method
Euskaraz hitz egiten dugu etxean.	We speak Basque at home.	Language used
Arazoaz hitz egin behar dugu.	We need to talk about the problem.	Topic with hitz egin
Zuretzat da hau.	This is for you.	Intended recipient
Opari bana erosi dugu haurrentzat.	We bought one present for each of the children.	Plural beneficiary
Ikastaro hau hasiberrientzat egokia da.	This course is suitable for beginners.	Intended audience
Eurigatik ez gara joan.	We did not go because of the rain.	Reason; the concept’s concise lexical form
Trafikoagatik berandu iritsi naiz.	I arrived late because of the traffic.	Cause
Zugatik egin nuen.	I did it because of you.	Pronominal form
Laguntzagatik eskerrak eman zizkion.	He/She thanked him/her for the help.	Grounds for thanks
Irakasletzat lan egiten du.	He/She works as a teacher.	Professional capacity
Denek aditutzat daukate.	Everyone regards him/her as an expert.	Classification
Kutxa aulkitzat erabili genuen.	We used the box as a chair.	Assigned function
Miren ordezkaritzat aukeratu dute.	They have chosen Miren as representative.	Appointed role

Common Mistakes

Using -z for a companion

• Wrong: Anez etorri naiz. (intended: “I came with Ane.”)
• Right: Anerekin etorri naiz.
• Why: -z marks a means or instrument. A person accompanying you normally takes sociative -rekin.

Translating every English “for” with -entzat

• Wrong: Anerentzat liburua eman diot. (intended: “I gave the book to Ane.”)
• Right: Aneri liburua eman diot.
• Why: The receiver of “give” takes the dative -ri. Use Anerentzat when something is intended or obtained for Ane: Anerentzat erosi dut.

Confusing beneficiary and reason

• Wrong: Zuretzat etorri naiz. (intended: “I came because of you.”)
• Right: Zuregatik etorri naiz.
• Why: zuretzat means “for you/for your benefit”; zuregatik gives the reason “because of you.” Both may be possible in different situations, but they do not say the same thing.

Keeping the article before -tzat

• Wrong: irakasleatzat lan egiten du
• Right: irakasletzat lan egiten du
• Why: A noun naming a role or classification before prolative -tzat is normally used without the article -a.

Adding a hyphen inside ordinary prolative forms

• Wrong: irakasle-tzat
• Right: irakasletzat
• Why: Case endings are normally written as part of the word. Use -tzat with a hyphen only when naming the suffix itself.

Attaching the ending to every word

• Wrong: niretzat lagunarentzat berriarentzat (intended: “for my new friend”)
• Right: nire lagun berriarentzat
• Why: Basque normally marks the whole noun phrase once, on its final element.

Usage Notes

These cases are productive in both speech and writing. Some instrumental forms are so common that they are best stored as ready-made vocabulary: euskaraz “in Basque,” telefonoz “by phone,” eskuz “by hand,” kasualitatez “by chance,” and kontuz “carefully.” Their English translations may no longer contain an obvious “with” or “by.”

Choice depends on meaning rather than on the English preposition. “For the children” is haurrentzat when a book is intended for them, but “because of the children” is haurrengatik. Likewise, English “as a teacher” can describe a genuine role with irakasletzat, while a plain identity statement uses the copula: Irakaslea da, “He/She is the teacher,” or Irakasle da, “He/She is a teacher,” depending on context and variety.

Forms can vary with definiteness and number, and natural usage sometimes preserves lexicalised patterns. This is why dictionaries and good example sentences are valuable. Do not build every form by taking the English noun, adding the Basque article, and then adding a memorised suffix. Notice complete contrasts such as lagunarentzat / lagunentzat, lanagatik / lanengatik, and liburuaz / liburuez.

Beyond the Basics / Advanced Use

The instrumental extends beyond concrete tools. It appears with topics (zerbaiti buruz is another common way to say “about something”), manner, material, cause-like expressions, and distributive expressions. In real texts, the best English equivalent may be “about,” “in,” “by,” “through,” or an adverb. Interpret its relationship to the verb before choosing a translation.

The motivative can express positive as well as negative motivation. Zuregatik lortu dut may mean “I achieved it thanks to you” or “because of you”; context supplies the attitude. For an explicitly positive reading, speakers can choose wording equivalent to “thanks to,” while -gatik itself remains neutral about whether the cause is welcome.

The prolative is especially important in complement structures—structures that complete the meaning of a verb. Compare:

Basque	English	Relationship
Jon medikua da.	Jon is the doctor.	Identity with a definite noun
Jon mediku da.	Jon is a doctor.	Profession or category in a copular statement
Jon medikutzat hartu dute.	They have taken Jon to be a doctor.	Assigned or assumed classification
Jon medikutzat izendatu dute.	They have appointed Jon as doctor.	Assigned role

Advanced writing also combines these endings inside longer noun phrases: gure taldearentzat oso adibide ontzat hartu dugu, “we have regarded it as a very good example for our group.” Each ending still has its own scope: gure taldearentzat identifies the beneficiary or relevant audience, while oso adibide ontzat gives the classification.

Finally, case endings do not replace every English preposition one-for-one. Basque organizes relationships through cases, postpositions, verb government, and subordinate clauses. A good advanced habit is to ask what relationship the phrase expresses—means, companion, recipient, beneficiary, reason, or role—rather than asking which suffix translates a particular English word.

Practice Tips

1. Build four-way meaning sets. Start with one situation and change the relationship: zurekin “with you,” zuretzat “for you,” zuregatik “because of you,” and an instrumental phrase such as zure laguntzaz “with your help.” Say what changes in each version.
2. Collect endings as complete chunks. Make a small list under transport (autoz, trenez, autobusez), beneficiaries (niretzat, haurrentzat), reasons (lanagatik, zugatik), and roles (adibidetzat, irakasletzat). This reinforces natural forms as well as meanings.
3. Ask one diagnostic question. Before choosing an ending, ask: “by what means?”, “for whose benefit?”, “for what reason?”, or “in what role?” Then produce a full sentence, not an isolated declined noun.

Related Concepts

• Prerequisite: Locative Cases — introduces the Basque pattern of adding case endings to noun phrases to express relationships such as “in,” “to,” and “from.”