Periphrasis reveals how the construction of meaning in language is apportioned between morphology ('bright' and 'brighter') and syntax ('intelligent' and 'more intelligent'). The Surrey Periphrasis database systematically catalogues data from a sample of 19 languages in a fully structured way to help explore the role of periphrasis in inflectional paradigms. 

Which instances of periphrasis take
as an auxiliary?