Ah, yes: In German you don't have to guess the gender like in English - the gender article defines this - if you use the correct one <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />
Der Apfel = the apple is masculine
Die Sonne = the sun is feminine
das Kind = the child is gender neutral <img src="/ubbthreads/images/graemlins/delight.gif" alt="" />
das Mädchen = the girl is gender neutral <img src="/ubbthreads/images/graemlins/delight.gif" alt="" /> <img src="/ubbthreads/images/graemlins/delight.gif" alt="" />
der Junge = the boy is masculine from the start <img src="/ubbthreads/images/graemlins/delight.gif" alt="" /> <img src="/ubbthreads/images/graemlins/delight.gif" alt="" /> <img src="/ubbthreads/images/graemlins/delight.gif" alt="" />
die Katze = the cat is feminine (animal race)
der Kater = the male cat, masculine
die Kaetzin = the female cat, feminine
der Hund = the dog, masculine (animal race)
die Huendin = the female dog, I don't know if "bitch" is only used for cussing
der Ruede = the male dog

So, if you don't use the noun you have to correspond by using the appropriate gender personal pronoun

er = he, masculine
sie = she, feminine
es = it, gender neutral

and if you use plural:
sie = they

Kiya