YOU SAID:
I have a red pencilbox
INTO JAPANESE
赤いペンシルボックスを持っている
BACK INTO ENGLISH
Have a red pencil box
INTO JAPANESE
赤い鉛筆箱を持っている
BACK INTO ENGLISH
I have a red pencil box.
INTO JAPANESE
私は赤い鉛筆箱を持っています。
BACK INTO ENGLISH
I have a red pencil box.
That didn't even make that much sense in English.