A large corpus (about 100 MB of text) was selected and examples of 750 fl'equently occurring verbs were tagged with their compleinent (:lass as defined by a large computational syntactic dictionary, COMLEX Syntax. This tagging task led to the refinement of already existing classes and to the addition of classes that had previously not been defined. This has resulted in the enrichment and improvement of the original COMLEX Syntax dictionary. Tagging also provides statistical data which will allow users to select, more common complelnents of a particular verb and ignore rare usage. We discuss below some of the problems encountered in tagging and their resolution.