One of these days the singer will be famous.

One of these days is none of these days.

I will call on him one of these days.

We'll visit you one of these days.

I'll take you there one of these days.

She will write another book one of these days.

He shall have a holiday one of these days.

We will have some visitors one of these days.

I will be seeing her again one of these days.

They say we'll have an earthquake one of these days.