YOU SAID:

I don't understand what to do

INTO JAPANESE

何をするかを理解していません。

BACK INTO ENGLISH

Do not know what to do.

INTO JAPANESE

何をするかわからない。

BACK INTO ENGLISH

I do not know what to do.

INTO JAPANESE

私は何をするかわからない。

BACK INTO ENGLISH

I don't know what to do with any of it.

INTO JAPANESE

私は何をするかわからない

BACK INTO ENGLISH

I don't know what to do with any of it.