You=너/당신 I= 나/저 He=그 She=그녀 It=그 You(Plurality)=너들 We=우리 They=그들

Wind's answer is good. But to add more details; 그 or 그녀 sounds a bit literary for native speakers. In spoken language, we are more likely to say 그 사람(that person), 그 애(that child, shortly 걔) instead of distinguishing by gender. That is why we sometimes ask "Yeah.. I understnad. So is the friend you are talking about a boy or a girl?" after 1 hour talk. If you want to include the gender, you can say 그 여자(that woman), 그 남자(that man), 그 여자애(that girl) or 그 남자애(that boy) And correction: 그 means 'THE'. 그 것 is 'IT' You(plural) is 너희들(반말: language we use for close people who are younger or same aged), 여러분(honorific), NOT 너들.