What is free morpheme?
1. Andrew Carstairs : Free morpheme is the smaller part of words (morpheme) that can stand on their own.
Ex : Hear-ing
2. Francis Katamba : Free morpheme is many words contain a root standing independently (roots which are capable of standing independently)
Ex : men book tea
Bet very pain
3. Mark Arronof : Free morpheme is like a stem in constituting the core of the word to which other pieces attach, but the term refers only morphologycally simple units.
Ex : dis-agree-ment