YOU SAID:

what does this do i dont understand

INTO JAPANESE

これは私が理解していない何をすべきか

BACK INTO ENGLISH

what this should do I don't understand

INTO JAPANESE

私が理解していない、これが何をすべきか

BACK INTO ENGLISH

I don't understand, this is what to do

INTO JAPANESE

私は理解していない、これは何をすべきかです

BACK INTO ENGLISH

I don't understand, this is what to do