nominative pl. of I.

(used to denote oneself and another or others)

We have two children. In this block we all own our own houses.

(used to denote people in general)

the marvels of science that we take for granted.

(used to indicate a particular profession, nationality, political party, etc., that includes the speaker or writer)

We in the medical profession have moral responsibilities.

Also called the royal we. (used by a sovereign, or by other high officials and dignitaries, in place of I in formal speech)

We do not wear this crown without humility.

Also called the editorial we. (used by editors, writers, etc., to avoid the too personal or specific I or to represent a collective viewpoint)

As for this column, we will have nothing to do with shady politicians.

you (used familiarly, often with mild condescension or sarcasm, as in addressing a child, a patient, etc.)

We know that's naughty, don't we? It's time we took our medicine.

(used in the predicate following a copulative verb)

It is we who should thank you.

(used in apposition with a noun, esp. for emphasis)

We Americans are a sturdy lot.