ξέρω να vs μπορώ να | Greek Grammar

English can can hide two different questions: Do you know how? and Are you able or allowed? Greek lets you state that distinction directly. Use ξέρω να + verb when acquired know-how is the point; use μπορώ να + verb for physical or practical ability, possibility, and permission. They naturally overlap when possessing a skill is what makes someone able to perform it.

The decision table

What you mean	Choose	Typical question
learned skill or know-how	ξέρω να	Have I learned how?
ability in the present circumstances	μπορώ να	Is it possible for me now?
permission or a request for permission	μπορώ να	Am I allowed to?
general or external possibility	μπορεί να	Can this happen?

The contrast is about the source of the ability, not simply whether the sentence refers to the present. A person may possess the skill and still be unable to exercise it because of an injury, a broken machine, lack of time, or a rule.

Ξέρω να οδηγώ, αλλά δεν μπορώ να οδηγήσω απόψε γιατί είμαι εξαντλημένος.

kséro na odhighó, alá dhen boró na odhiyíso apópse yatí íme eksandliménos

I know how to drive, but I can't drive tonight because I'm exhausted.

Η Άννα ξέρει να κολυμπάει, αλλά σήμερα δεν μπορεί να μπει στη θάλασσα.

i Ána kséri na kolimbái, alá símera dhen borí na bi sti thálasa

Anna knows how to swim, but today she can't go into the sea.

These paired clauses show why a one-word English translation is not enough. ξέρει να κολυμπάει stores a fact about Anna's competence; δεν μπορεί να μπει reports a present obstacle. Neither clause cancels the other.

ξέρω να: knowledge made practical

Choose ξέρω να when a skill has been learned, acquired through experience, or otherwise forms part of what someone knows how to do. It is neutral in both conversation and ordinary writing. The construction often occurs with an imperfective verb because skills are commonly viewed as open abilities rather than as one bounded performance; that is a frequent meaning pattern, not a separate rule imposed by ξέρω.

Ξέρεις να αλλάζεις λάστιχο ή να καλέσουμε βοήθεια;

kséris na alázis lásticho i na kalésume voíthia;

Do you know how to change a tyre, or should we call for help?

Δεν ξέρω να χρησιμοποιώ αυτό το λογιστικό πρόγραμμα ακόμα.

dhen kséro na chrisimopió aftó to loyistikó próghrama akóma

I don't know how to use this accounting program yet.

The negative δεν ξέρω να… means that the know-how is absent. It is stronger and more specific than saying that someone cannot perform the action on one occasion. Full forms and other meanings of ξέρω belong on the ξέρω reference page.

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Test the sentence by adding “because nobody taught me.” If that explanation fits, ξέρω να is probably the contrast you need. If “because the door is locked / I am busy / it is forbidden” fits, choose μπορώ να.

μπορώ να: capacity, circumstances, and permission

μπορώ να is the wider modal. It says that an action is within someone's capacity or available under the circumstances; in a question it can also request permission. The verb itself does not tell you which reading applies. Situation, relationship, and intonation do that work.

Μπορείς να σηκώσεις αυτή την κούτα μόνος σου;

borís na sikósis aftí tin kúta mónos su;

Can you lift this box by yourself?

Μπορώ να φύγω λίγο νωρίτερα σήμερα;

boró na fígho lígho norítera símera;

May I leave a little earlier today?

The first question is naturally about physical capacity. The second is normally a request for permission, especially to a manager or teacher. In a different setting, however, the same grammar could ask about practical possibility. Greek does not need a different modal for English can and may.

Third-person μπορεί να also expresses possibility rather than anybody's skill:

Με τόση ομίχλη, μπορεί να ακυρωθεί η πτήση.

me tósi omíchli, borí na akirothí i ptísi

With this much fog, the flight may be cancelled.

That possibility use and the past/conditional choices μπορούσα, μπόρεσα, and θα μπορούσα are owned by modal μπορεί and the μπορώ reference page. This page only decides between current know-how and modal possibility.

Where both are possible

Sometimes both constructions describe the same person and activity, but they answer different questions.

Ο Πέτρος ξέρει να φτιάχνει ποδήλατα· το έμαθε από τον πατέρα του.

o Pétros kséri na ftiáchni podhílata· to émathe apó ton patéra tu

Petros knows how to repair bicycles; he learned from his father.

Ο Πέτρος μπορεί να φτιάξει το ποδήλατό σου μέχρι την Παρασκευή.

o Pétros borí na ftiáksi to podhílató su méchri tin Paraskeví

Petros can repair your bicycle by Friday.

The first sentence profiles competence. The second makes a practical commitment about a bounded job and deadline. It may imply competence through common sense, but μπορεί itself contributes availability or feasibility, not the claim “he has learned how.”

The same distinction matters with familiar skills:

Ξέρω να μαγειρεύω, απλώς δεν μπορώ να ετοιμάσω δείπνο για είκοσι άτομα σε μία ώρα.

kséro na mayirévo, aplós dhen boró na etimáso dhípno ya íkosi átoma se mía óra

I know how to cook; I just can't prepare dinner for twenty people in an hour.

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μπορώ να does not guarantee expertise. Someone can be allowed to try, available to help, or physically capable of acting without claiming to know the task well.

Common Mistakes

Translating every English “can” with μπορώ

For an acquired skill, μπορώ να is not necessarily ungrammatical, but it leaves the know-how contrast unstated. Choose ξέρω να when learning the skill is the point.

Ξέρω να διαβάζω παρτιτούρα, αλλά παίζω μόνο για φίλους.

kséro na dhiavázo partitúra, alá pézo móno ya fílus

I can read music, but I only play for friends. (learned skill)

Using ξέρω να for a temporary opening

A free afternoon, an unlocked room, or permission is not knowledge. μπορώ selects the available opportunity.

Μπορώ να σε δω μετά τις έξι, όταν τελειώσει η συνεδρίαση.

boró na se dho metá tis éksi, ótan teliósi i sinedhríasi

I can see you after six, when the meeting ends. (availability)

Assuming ξέρω να requires a completed one-off verb

Know-how is usually presented as an open ability, so an imperfective form is common. Aspect still describes viewpoint, not “once versus repeated.”

Η γιαγιά μου ξέρει να διηγείται ιστορίες που σε κρατούν ξύπνιο.

i yayiá mu kséri na dhiiyíte istoríes pu se kratún ksípnio

My grandmother knows how to tell stories that keep you awake.

Reading every Μπορώ να…; as permission

Context decides whether the speaker asks permission, capacity, or feasibility.

Μπορώ να ανοίξω το αρχείο από το κινητό ή χρειάζομαι υπολογιστή;

boró na aníkso to archío apó to kinitó i chriázome ipoloyistí;

Can I open the file from my phone, or do I need a computer? (practical possibility)

Key Takeaways

ξέρω να identifies learned know-how: “I know how to.”
μπορώ να covers capacity, circumstances, possibility, and permission.
The two can coexist: someone may know how but be unable to act today.
Choose from the source of the ability, not from a one-word English translation of can.

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