YOU SAID:
I know what we are going to do today!
INTO JAPANESE
私は、我々 が今日やること、知っている!
BACK INTO ENGLISH
I know that we have to do today!
INTO JAPANESE
私は、我々 が今日持っている知っている!
BACK INTO ENGLISH
We have today, I know!
INTO JAPANESE
我々 が今日持っていると私は知っている!
BACK INTO ENGLISH
I know that we have today!
INTO JAPANESE
私は、我々 が今日持っていることを知っている!
BACK INTO ENGLISH
I know that we have today!
That didn't even make that much sense in English.