3.1 3.2 3.3 3.3.1  3.3.2  3.4
The differences between “root”, “stem” and “base”?
Root/ 词根derivational or inflectionalStem/ 词干inflectional affixesBase/ 词基
undesirables         = un + desire + able + sBase:       desirable             → desire (base)       undesirable             → desirable (base)       undesirables             → undesirable (base)Base/词基: any form to which affixes of any kind can be added.