When do you use "dich" and "dir" in German?? :/ Bitte!! Danke!!:)

Question

When do you use "dich" and "dir" in German?? :/  Bitte!! Danke!!:)

Answer

Hi, Eliot is right about that. If you look up a word in a dictionary, you can gather which form to use::

to ask sn.     --     jmdn. fragen -> dich fragen
to tell sn.     --     jmdm. sagen -> dir sagen

jmdn = jemanden (accusative form of jemand)
jmdm = jemandem (dative form of jemand)

Answer

dich = accusative
dir = dative

I take it you understand accusative and dative. If not, your question is far too general.