さて、本腰を入れてまじめな話をしよう。の英語

Now let us get down to a serious talk.

Let's dispense with formalities and talk frankly.

Well, let's talk turkey.

Let's be careful to whisper here.

Calm down and begin at the beginning.

I will tell you.

Let's calm down and have a discussion.

Let's calmly have a discussion.

Let me tell you a little bit of the inside story.

Let's talk turkey.

I would tell you if you would just listen quietly.

Alright, tell me a funny story!

Come on! Out with it!

Let's be done with the argument.

Let's end this debate.

Let's have done with the argument.

Tell me truly what you think.

It's time to get down to business.

Sure, let's talk in English.

Please speak a little more slowly.

Let the matter drop.

Speak slowly and clearly.

Speak and behave naturally.

Let me tell you an interesting story.

Let me tell you an amusing story.

Let's hash it all out.

Let's talk about each other a lot so that we understand well.

Can we talk about something serious?

I'll tell you a story.

We can be a bit more private here.