After Prepositions: pre teba, s ním, o nej

After a preposition Slovak uses the long pronoun forms, and on, ona, ono and oni start with n-.

• ja: pre mňa, ku mne, so mnou
• ty: pre teba, o tebe, s tebou
• on: bez neho, k nemu, o ňom, s ním
• ona: na ňu, k nej, o nej, s ňou
• my / vy: pre nás / vás, s nami / vami
• oni: pre nich, k nim, o nich, s nimi
• oneself: na seba, pri sebe, so sebou

The preposition chooses the case: bez, od, u, do, vedľa + genitive, k, proti + dative, pre, na + accusative, o, pri + locative, s, pred + instrumental. Before mne, k becomes ku; before mnou and sebou, s becomes so.