1. You can say that again! 说的好！一点儿都没错！

如果别人和你说“You can say that again!”可别以为是让你再说一遍，而是告诉你“你说的一点儿没错，我很赞成”。

If only there were no exams！We all need more rest.

You can say that again.

要是没有考试就好了！我们都需要更多的休息。

一点儿没错！

2. I couldn't agree more! 我太同意了！

除了I couldn't agree more.，我不能再同意了也可以说I certainly agree with that. I certainly agree with that.就是完全同意，是因为你说得非常的对呀！

Ed Sheeran's new songs are so good !

I couldn't agree more!

艾德·希兰的新歌都好棒！

一点儿没错！

3. I'm with you on that. 我同意你的看法！

With

英 [wɪð] 美 [wɪð; wɪθ]

prep. 用；随着；支持；和…在一起

with you 是和你在一起的意思，这句话表达的就是在这方面我和你在一起，也就是我和你的想法一致。

I hate working overtime, especialy without the overtime fee.

I'm with you on that.

我讨厌加班，尤其是没有加班费的加班。

我很同意了。

出处：头条号 @VOA英文口语