YOU SAID:

I don't know what I will do this evening.

INTO JAPANESE

私はこの夜を何、知らない。

BACK INTO ENGLISH

I know, what this evening.

INTO JAPANESE

私は、今晩何を知っています。

BACK INTO ENGLISH

I know what this evening.

INTO JAPANESE

私は今晩何を知っています。

BACK INTO ENGLISH

I know what this evening.