That's all right=It doesn't matter 用于,表示没关系
i 've spilledsome coffee on the carpet句意为：我把咖啡洒到了地毯-------对方说That's all right=It doesn't matter 用于表示 没关系
That's OK =You are welcome用于表示 不用谢
表请求建议用No problem
Could i use your book ?回答No problem
It's all right
这句话很有用,许多场合都用得上,基本上是"没关系"的意思.也可以表示"我没事","已经没事了"之类