them

1 (as a direct object) : los Spain sometimes les, las <I know them : los conozco>
2 (as indirect object) : les, se <I sent them a letter : les mandé una carta> <give it to them : dáselo (a ellos)>
3 (as object of a preposition) : ellos, ellas <go with them : ve con ellos>
4 (for emphasis) : ellos, ellas <I wasn't expecting them : no los esperaba a ellos>