5. The method as recited in claim 1 , wherein generating the one or more annotated alternative versions of the input annotated phrase includes applying one or more transformation rules to nodes of the syntactic tree.
7. The method as recited in claim 5 , wherein applying one or more transformation rules to nodes of the syntactic tree includes omitting an expression of the input annotated phrase within an alternative version of the one or more versions generated, the expression associated with a node of the syntactic tree generated.