that's right是什么的答语

认同他人的说法时～～=是的，对的。
估计你是把它和that's all right弄混了。

that's all right=没关系，是别人向你道歉时的答语。

“That's all right.”是有人对你致谢或道歉时的客气答语。如:
—Thank you very much.
—That's all right./You are welcome. / My pleasure.(不用谢。)