黙ってさえいればいいのですよ。の英語

You have only to keep silent.

You can stay only if you're quiet.

You can stay if only you are quiet.

You can stay only if you are quiet.

You should have kept your mouth shut.

You should've kept your mouth shut.

Shut up, or I'll kick you out.

You had best keep silent.

It is wise of you to keep silent.

It will be （to） your interest to remain silent.

Let him alone. He'll soon come around by himself.

It would be wiser [safer, more sensible] to keep silent on this occasion [at this juncture].

I should've kept my mouth shut, right?

If you say so, you are telling a lie.

If you're going to complain, do it yourself.

It is better left unsaid.

Keep the change.

You're kind to say so.

You are kind to say so.

You had better leave it unsaid.

... Aaah, just how am I supposed to cope with this I wonder?

Please put the chair away. It is in the way.

Please move the chair. It's in the way.

It's okay to take it easy sometimes.

You shouldn't say it.

Stop. That's enough.

You had better leave it unsaid.

You may as well give up.

You had better relax a bit.

You'd better relax a bit.