YOU SAID:

I want to go shopping to buy a piece of paper.

INTO JAPANESE

私は紙を買いに買いに行きたい。

BACK INTO ENGLISH

I want to go buy paper.

INTO JAPANESE

紙を買いに行きたい。

BACK INTO ENGLISH

I want to go buy some paper.

INTO JAPANESE

紙を買いに行きたい。

BACK INTO ENGLISH

I want to go buy some paper.