YOU SAID:

i have a red pencil box

INTO JAPANESE

私は赤い筆箱を持っています

BACK INTO ENGLISH

I have a red pencil case

INTO JAPANESE

赤の筆箱があります

BACK INTO ENGLISH

There is a red pencil case

INTO JAPANESE

赤の筆箱があります

BACK INTO ENGLISH

There is a red pencil case