That's right意为“对的”，表示赞同对方的意见、看法或行为，肯定对方的答案或判断。例如："I think we must help the old man.""我想我们应该帮助这位老人。"
"That's right."或 "You're right.""说得对"。
That's all right.意为“不用谢”、“没关系”，用来回答对方的致谢或道歉。例如：
"Many thanks." "That's all right.""Sorry. It's broken." "That's all right."
All right.意为“行了”、“可以”，表示同意对方的建议或要求。有时还可以表示“身体很好”
"Please tell me about it.""请把此事告诉我。""All right.""好吧。"
Is your mother all right?你妈身体好吗