这就对了用英语怎么说？

在英语中，一般可以用 "That's right" 或 "That's correct" 来表示 "这就对了" 的意思。

来源：

这两个短语都来自英语的日常用语。"That's right" 是用来表示同意或赞同的意思，例如：

A: "Do you think we should go to the park tomorrow?"

B: "Yes, that's right. Let's go to the park tomorrow."

"That's correct" 则是用来表示结果或答案是正确的意思，例如：

A: "What's the capital of France?"

B: "Paris. That's correct."

英文例句及中文翻译：

A: "I heard that the earth is round."

B: "Yes, that's correct. The earth is indeed round."

A: "Do you agree that we should go to the movies tonight?"

B: "Yes, I do. That's right, let's go to the movies tonight."