YOU SAID:
slip the paper inside the folder
INTO JAPANESE
フォルダーの中に紙を入れる
BACK INTO ENGLISH
Put paper in the folder
INTO JAPANESE
紙をフォルダーに入れる
BACK INTO ENGLISH
Put paper in a folder
INTO JAPANESE
紙をフォルダーに入れる
BACK INTO ENGLISH
Put paper in a folder
You've done this before, haven't you.