Take a word like FLING, add the letter I, and you have filing. Described below are other word-pairs in which one becomes the other merely by the addition of I. Answers are found in Answers and Solutions at the end of this issue.
Youngquist, Mary J.
"Hey, Look What I Can Do,"
Word Ways: Vol. 4
, Article 6.
Available at: http://digitalcommons.butler.edu/wordways/vol4/iss4/6