YOU SAID:

All I have is one request

INTO JAPANESE

私が言いたいのは一つだけ

BACK INTO ENGLISH

I want to say it's only one.

INTO JAPANESE

私は 1 つだけだと言いたいです。

BACK INTO ENGLISH

You want to say I'm the only one.

INTO JAPANESE

私は 1 つだけ言いたいです。

BACK INTO ENGLISH

I want to say just one.

INTO JAPANESE

私は 1 つをしたいと思う。

BACK INTO ENGLISH

I think I want one.

INTO JAPANESE

私は 1 つをしたいと思います。

BACK INTO ENGLISH

I think I want one.