YOU SAID:
I don't know. I dunno.
INTO JAPANESE
わからない。私は知らないよ。
BACK INTO ENGLISH
do not know. I dunno.
INTO JAPANESE
わかりません。私は知らないよ。
BACK INTO ENGLISH
do not understand. I dunno.
INTO JAPANESE
理解していない。私は知らないよ。
BACK INTO ENGLISH
do not understand. I dunno.
Come on, you can do better than that.