it'OK与That's OK有何区别?怎么用?

it'OK与That's OK有何区别?怎么用? “It's ok”“That's ok”的区别~ that's ok与forget it表没关系的区别 请问That's OK和It's OK有什么区别啊? That's OK 与All right 有什么区别? Ok,that's it?怎么翻译? That's the case何意?That depends?何时用It's OK? That's ok与that's all right的区别 that's right 与that's OK的区别? it's ok和that's ok、it's right和that's right像这类的怎么比较它们的区别? 请问It doesn't matter和That's ok有区别吗? it doen\'t matter 和that\'s ok有什么区别