Pronombres de objeto directo
In English you say 'I see her' — 'her' replaces a noun. Spanish does the same, but the pronoun goes BEFORE the verb: la veo. This is everyday Spanish — without it, sentences get clunky.
The full set
me = me. te = you (informal). lo = him / it (m.) / you (formal m.). la = her / it (f.) / you (formal f.). nos = us. os = you all (informal, Spain only). los = them (m.) / you all (formal m.). las = them (f.) / you all (formal f.).
Where they go
Right before the conjugated verb: Te veo (I see you). Lo compro (I buy it). Las leemos (we read them). Same position in questions and negation: ¿Lo ves?, No lo veo.
With infinitives and gerunds
When there's a helper construction (e.g. voy a + inf, puedo + inf), you have a choice: Voy a verlo = Lo voy a ver. Both are correct. Note: when attached to an infinitive, the pronoun is glued onto the END as one word: verlo, comerlo, hablarme.
Agreement with the noun
The pronoun matches the noun it replaces in gender and number. Compro el libro → Lo compro (libro is m.). Compro la casa → La compro. Veo a mis amigos → Los veo. Escucho las canciones → Las escucho.
Personal 'a' and pronouns
If the object is a person, the noun version had a in front (the personal a). The pronoun version drops it: Veo a María → La veo (not 'a la veo').
