A prepositional phrase begins with a preposition and ends with its complement: en la ĝardeno, pri la projekto, kun mia fratino. The phrase can modify a verb, a noun, an adjective, or an entire clause. Because the same words can sometimes support more than one attachment, clear Esperanto uses proximity, position, and explicit rephrasing—not case endings alone—to show the intended structure.
Attachment to a verb
Some prepositional phrases are selected by the verb itself:
Ni parolis pri la venonta konferenco.
We talked about the upcoming conference.
La fina decido dependas de la disponebla buĝeto.
The final decision depends on the available budget.
Paroli pri and dependi de are lexical frames. The preposition identifies the role expected by the verb, so keeping the phrase near the verb helps the reader recognize the frame.
Other phrases add optional circumstances:
Ni parolis pri la konferenco en la kuirejo post la vespermanĝo.
We talked about the conference in the kitchen after dinner.
Pri la konferenco supplies the selected topic. En la kuirejo and post la vespermanĝo locate the event. A useful neutral tendency is selected complement before broader place and time adjuncts.
Attachment to a noun
A prepositional phrase immediately after a noun often describes or identifies that noun:
La libro pri urbaj ĝardenoj estas sur la supra breto.
The book about urban gardens is on the upper shelf.
Mi renkontis la virinon kun la ruĝa valizo.
I met the woman with the red suitcase.
La ŝlosilo de la malantaŭa pordo ankoraŭ mankas.
The key to the back door is still missing.
These postmodifiers belong inside the noun phrase: la [libro pri urbaj ĝardenoj]. If the whole noun phrase moves, its modifier normally moves with it.
La libron pri urbaj ĝardenoj mi redonos morgaŭ.
The book about urban gardens, I will return tomorrow.
Leaving pri urbaj ĝardenoj at the end—La libron mi redonos morgaŭ pri urbaj ĝardenoj—makes it look like a topic complement of redonos, which that verb does not license.
Attachment to an adjective
Adjectives can also select prepositional complements:
Ŝi estas kontenta pri la rezulto.
She is satisfied with the result.
La teamo estas preta por la morgaŭa prezento.
The team is ready for tomorrow's presentation.
Inside a noun phrase, the adjective and its complement should remain together:
Ni serĉas homon spertan pri internaciaj kontraktoj.
We are looking for someone experienced in international contracts.
Postposition is clearer than spertan pri internaciaj kontraktoj homon, where the long complement separates adjective and noun. A compact preposed alternative—pri internaciaj kontraktoj sperta homo—is grammatical but dense (formal/academic).
Clause-level framing
A prepositional phrase at the beginning can frame the whole proposition by time, source, viewpoint, condition, or domain.
Laŭ la veterprognozo, morgaŭ posttagmeze neĝos.
According to the weather forecast, it will snow tomorrow afternoon.
Pro la fervoja striko, pluraj gastoj alvenos malfrue.
Because of the rail strike, several guests will arrive late.
Pri la prezo, ni ankoraŭ ne atingis interkonsenton.
As for the price, we have not yet reached an agreement.
Initial position and a pause make whole-clause scope natural. The last example is a topic frame, not a selected complement of atingi. In speech, intonation helps; in writing, a comma often marks the detached frame.
Moving a short selected phrase to the beginning is also possible for contrast:
Pri la horaro ni jam decidis; pri la prelegantoj ni diskutos morgaŭ.
We have already decided about the schedule; we will discuss the speakers tomorrow.
Parallel placement makes both topic relationships explicit.
The classic ambiguity: instrument or noun modifier
Consider this sentence:
Mi vidis la viron kun binoklo.
I saw the man with binoculars. (Ambiguous: who had the binoculars?)
Kun binoklo can attach to la viron (“the man who had binoculars”) or to vidis (“I used binoculars”). Esperanto has not magically eliminated the attachment ambiguity found in English.
Make the instrument reading explicit with per and clause-level placement:
Per binoklo mi vidis la viron trans la rivero.
Using binoculars, I saw the man across the river.
Make the noun-modifier reading explicit with a relative clause:
Mi vidis la viron, kiu portis binoklon.
I saw the man who was carrying binoculars.
Choosing the semantically exact preposition matters too: per marks the means; kun marks accompaniment or possession. Word order cannot repair a wrong semantic relation.
Competing noun attachments
A phrase can also be close to two nouns:
Ni diskutis la proponon de la direktoro pri la nova horaro.
We discussed the director's proposal about the new schedule.
The natural reading attaches de la direktoro to proponon and pri la nova horaro to proponon as its content. But stacked modifiers can make readers wonder whether the director is somehow “of the schedule” or whether pri belongs to diskutis.
Rewrite when the internal relationships matter:
La direktoro proponis novan horaron, kaj ni diskutis lian proponon.
The director proposed a new schedule, and we discussed the proposal.
Ni diskutis la proponon, kiun la direktoro faris pri la nova horaro.
We discussed the proposal that the director made about the new schedule.
A relative clause, a possessive, or two sentences can expose the structure more reliably than a long chain of prepositional phrases.
Competing verb and noun attachment
An end-position phrase after an object may modify either the object or the event:
Ŝi fotis la infanon sur la balkono.
She photographed the child on the balcony. (Ambiguous: who was on the balcony?)
For the photographer's location, move the phrase to the front:
Sur la balkono ŝi fotis la infanon en la ĝardeno.
On the balcony, she photographed the child in the garden.
For the child's location, attach an explicit relative clause or use a participial description:
Ŝi fotis la infanon, kiu staris sur la balkono.
She photographed the child who was standing on the balcony.
Punctuation can signal a supplementary reading, but it cannot always identify who occupies a location. Lexical repetition is preferable to elegant ambiguity.
Prepositions cannot be stranded
The preposition and its complement form one constituent. In questions and relative clauses, move the preposition with the ki- word.
Pri kiu projekto vi parolas?
Which project are you talking about?
Jen la projekto, pri kiu ni parolis hieraŭ.
Here is the project that we talked about yesterday.
English often leaves about at the end. Standard Esperanto does not say Kiu projekto vi parolas pri? or la projekto, kiu ni parolis pri. The complete unit pri kiu marks the role at the point where the relative or interrogative word appears.
See Relative Case inside the Clause for the roles of kiu, kiun, and preposition + kiu in relative clauses.
Case inside a prepositional phrase
An ordinary preposition governs an unmarked complement:
Ni atendis antaŭ la teatro.
We waited in front of the theater.
Some spatial prepositions allow directional -n when the phrase expresses movement into a new location:
Ni kuris antaŭ la teatron por eviti la pluvon.
We ran to the area in front of the theater to avoid the rain.
That case contrast changes the internal meaning of the phrase; it does not determine whether the phrase attaches to a verb or noun. Attachment still comes from syntax and context.
End weight and multiple phrases
When several prepositional phrases accumulate, place short selected roles near their head and a long phrase at the edge:
La sekretario sendis la kontrakton al la posedanto per retpoŝto post la fina kontrolo de ĉiuj paĝoj.
The secretary sent the contract to the owner by email after the final check of all the pages.
The recipient follows the transfer core, the channel follows it, and the heaviest time phrase comes last. An initial time frame is equally clear:
Post la fina kontrolo de ĉiuj paĝoj, la sekretario sendis la kontrakton al la posedanto per retpoŝto.
After the final check of all the pages, the secretary sent the contract to the owner by email.
No universal formula decides every order. The normative principle is comprehensibility: arrange phrases so that each attachment can be recovered on the first reading.
Common Mistakes
1. Copying English preposition stranding
❌ Kiu temo vi parolis pri?
Incorrect — pri must remain before the interrogative expression it governs.
✅ Pri kiu temo vi parolis?
Which topic did you talk about?
2. Using kun when the phrase is an instrument
❌ Kun binoklo mi observis la birdojn.
Incorrect for the intended means — kun suggests accompaniment or possession.
✅ Per binoklo mi observis la birdojn.
I observed the birds through binoculars.
3. Assuming nearest position always guarantees one attachment
❌ ‘Ŝi fotis la infanon sur la balkono’ klare diras, ke nur la infano estis tie.
Incorrect claim — the final phrase can describe the child or the photographing event.
✅ Ŝi fotis la infanon, kiu sidis sur la balkono.
She photographed the child who was sitting on the balcony.
4. Separating an adjective from its selected complement
❌ Ni dungis spertan konsultiston pri impostjuro.
Ambiguous for the intended reading — pri impostjuro can attach to consultant rather than to sperta.
✅ Ni dungis konsultiston spertan pri impostjuro.
We hired a consultant experienced in tax law.
Key Takeaways
- A prepositional phrase can attach to a verb, noun, adjective, or whole clause.
- Keep selected complements close to their head and put broad setting phrases at a clause edge.
- Proximity helps but cannot resolve every ambiguity; explicit relatives and recasting are often better.
- Never strand an Esperanto preposition: use pri kiu, kun kiu, en kiu, and similar complete units.
- Directional case changes meaning inside certain spatial phrases, not their external attachment.
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Start learning Esperanto →Related Topics
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- Noun Phrase Word OrderA2 — Arrange determiners, numbers, adjectives, a head noun, and heavier postmodifiers into clear Esperanto noun phrases.
- Avoiding Ambiguity in Free OrderB1 — Use Esperanto's flexible constituent order without obscuring grammatical roles, modifier attachment, particle scope, or information structure.
- Verb-Preposition FramesB1 — Learn which Esperanto verbs take direct objects and which select al, pri, de, kun, or je—and how the frame changes meaning.
- Pronouns after PrepositionsB2 — Use basic, reflexive, and directional pronoun forms accurately after Esperanto prepositions.
- Relative Case inside the ClauseA2 — How the case and preposition of kiu are determined inside the relative clause, independently of the antecedent’s role.