Free and bound morphemes.
From these examples, we can make a broad distinction between
two types of morphemes.Thereare
freemorphemes,thatis,morphemesthatcanstandbythemselvesas
single words, for example, open and tour. There are also bound
morphemes, which are
thoseformsthatcannotnormallystandaloneandaretypicallyattachedt
oanotherform, exemplifiedas re-, -ist, -ed, -s.