YOU SAID:

i just dont understand i though it was blue

INTO JAPANESE

私はそれが青だったが、私を理解していない

BACK INTO ENGLISH

I didn't understand me though it was blue

INTO JAPANESE

青いけど、私は理解していなかった

BACK INTO ENGLISH

It's blue, but I didn't understand.

INTO JAPANESE

青いけど、分からなかった。

BACK INTO ENGLISH

It's blue, but I didn't know.

INTO JAPANESE

それは青ですが、私は知りませんでした。

BACK INTO ENGLISH

It's blue, but I didn't know.