The n- Forms After Prepositions

Czech third-person pronouns have a split personality. Used as a bare object, he is ho or jeho; but the moment a preposition sits in front of it, the very same pronoun grows an extra n- and becomes něj or něho. This n- appears on on, ona, ono, oni and all their case forms whenever they follow a preposition — and on no other pronouns. Once you see the rule, the long list of forms like na něj, k němu, o ní, s nimi stops looking random.

The rule in one line

A preposition triggers the n- form. No preposition, no n-.

Same man, same pronoun, two shapes — and the only thing that changed is whether a preposition came first. This pairing is the whole lesson; everything below just fills in the genders and cases.

Where the n- comes from

The n- is not decoration — it is a fossil. The oldest Slavic prepositions ended in a nasal consonant (an old -n on words behind today's k, s, v), and over the centuries that final -n detached from the preposition and re-glued itself to the front of the pronoun. So an old k jemu was reanalysed as k němu, and the pattern then spread to every preposition by analogy. Knowing this, you can see why only prepositions trigger it: the n- literally used to belong to the preposition.

The full picture, gender by gender

He / it (on, ono — masculine and neuter)

Masculine and neuter share most forms. The bare object form is on the left; the n- form you use after any preposition is on the right.

She (ona — feminine)

They (oni / ony / ona — plural, all genders)

In the plural, all three genders share one set of forms.

The locative is always an n- form

Notice the dashes in the tables: the locative case has no bare form at all, because the locative in Czech only ever appears after a preposition (o, na, v, při). That means the third-person locative pronouns — něm, ní, nich — are always n- forms. There is no such thing as a prepositionless jěm; it simply does not exist.

This is only a third-person thing

Crucially, the n- jump happens only to on / ona / ono / oni. First- and second-person pronouns never take it: na mě (onto me), ke mně (to me), o tobě (about you), s námi (with us), bez vás (without you) — all preposition + plain pronoun, no n- in sight. So if you catch yourself wanting to add an n- to anything other than a he/she/it/they, stop: the rule does not apply.

A handful you will use every day

Some preposition-plus-pronoun combinations are so frequent that it pays to memorize them as whole chunks rather than rebuilding them each time. Drill these out loud until they feel automatic.

That last example is the whole rule in miniature: the very same preposition vedle leaves the first-person mě untouched but turns the third-person pronoun into něj. The n- is purely a third-person reflex.

Common mistakes

Key takeaways

• Preposition → n- form; no preposition → bare form. That single switch drives everything.
• na něj, k němu, o něm, s ním (he/it); bez ní, k ní, o ní, s ní (she); od nich, k nim, o nich, s nimi (they).
• The locative (o něm, o ní, o nich) is always an n- form, because the locative never stands without a preposition.
• Only third-person pronouns do this — never mě, tě, nás, vás.
• Feminine accusative is short ni (pro ni); the other feminine forms are long ní.