Another syntactical verb feature tagged in the Lemmas Lexicon is the type of auxiliary with which a verb is conjugated. There are three tags:
| Attribute | Value | Du. example | Du. tag |
| Auxiliary | hebben | doen | hebben |
| zijn | groeien | zijn | |
| hebben or zijn | volgen | hebben/zijn | |
Note that many verbs are tagged with double or triple tags because they can have two or three values. This is the common Dutch dictionary practice to mark verb use.