The Different Types of Double Headed Verbs

Double headed Auxiliary verb constructions are the most common form. In these both the auxiliary And the lexical verb are marked for subject and object if the language has polyperson agreement. Some languages that are sensitive to number more than person on the verb may double the number On both the auxiliary and the lexical verbs. While it can be hard to distinguish these double marked Constructions from serial verb constructions, they do happen.