it

1 (as subject; generally omitted) : él, ella, ello <it's a big building : es un edificio grande> <who was it? : ¿quién era?>
2 (as indirect object) : le <I'll give it some water : voy a darle agua>
3 (as direct object) : lo, la <give it to me : dámelo>
4 (as object of a preposition; generally omitted) : él, ella, ello <behind it : detrás, detrás de él>
5 (in impersonal constructions) <it's raining : está lloviendo> <it's 8 o'clock : son las ocho>
6 (as the implied subject or object of a verb) <it is necessary to study : es necesario estudiar> <to give it all one's got : dar lo mejor de sí>