I don't agree with you./I don't agree at all.

我不赞同你/我根本不认同

You're completely wrong.

你完全错了。

You couldn't be more wrong.

你大错特错。

You've got it totally wrong.

你完全错了。

I'm afraid you missed the point here.

恐怕你误解了。

I won't go along with this.

我不同意这个。

It would never work.

那决定行不通。

I doubt that's true./I don't think so./I don't think that's true.

我怀疑那是真的/我不这么认为/我不觉得这是真的

That can't be right.

那不可能是对的。

I don't see it that way.

我不这么看。

We don't see eye to eye on this issue.

在这个问题上我们意见不一致。

Dialogue1:

A: What do you think of this plan?

你觉得我的计划怎么样？

B: Have you thought of the consequences of your idea?

你有没有想过你的想法可能造成的后果？

Dialogue2:

A: Okay, that might work, but don't you think there's a better solution?

好吧，那或许有效果，但是你不觉得有更好的解决办法？

B: I think John has a better solution to this problem.

我认为约翰在这个问题上有更好的解决办法。

Dialogue3:

A: That's my suggestion to this issue.

这是我对这个问题的建议。

B: I understand where you're coming from, but I think there's a better solution.

我明白你的出发点，但是我认为有更好的解决方案。