YOU SAID:

I don't know what to tell you.

INTO JAPANESE

私は何を言うかわからない。

BACK INTO ENGLISH

I do not know what I say.

INTO JAPANESE

私は何を言うのかわからない。

BACK INTO ENGLISH

I don't know what I say.

INTO JAPANESE

私は何を言うか分からない。

BACK INTO ENGLISH

I don't know what I say.