Look for verbs selecting a VBN verb.
This is now a zeroeth order observed data only feature.
But reminiscent of what was done in Toutanova and Manning 2000.
It doesn't seem to help tagging performance any more.
This evaluates any precondition for a feature being applicable based
on a certain tag. It returns true if the feature is applicable.
By default an Extractor is applicable everywhere, but some
subclasses limit application.