verb.rb in zenlish-0.2.00

- old
+ new

@@ -1,9 +1,17 @@
 require_relative 'word_class'
 
 module Zenlish
   module WClasses
-    # TODO: document
+    # Abstract class. In traditional grammar, the verb is often defined 
+    # notionally as a 'doing' word (i.e. a word that describes the action
+    # in a clause).
     class Verb < WordClass
+    
+      # As all verbs inflect, or change form, to reflect changes in tense,
+      # person, number, and voice, they are, by definition, variable.
+      def invariable?
+        false
+      end
     end # class
   end # module
 end # module
\ No newline at end of file