Modal auxiliaries select a bare infinitive, which always has the form of an ordinary infinitive, so it ends in schwa, except with a handful of verbs of which the infinitive ends in the vowel -o, such as dwo ‘do’. Furthermore, the tensed forms of the modal auxiliary houge ‘need’ usually select a to-infinitive, see: Raising auxiliaries selecting to-infinitives (4.1). Below are some examples of modals selecting a bare infinitive:

Most examples also illustrate that the selecting modal, if it occurs inside the verb cluster, is placed to the right of its infinitive. It is not clear whether there are instances of modal verbs (other than hougje ‘need’) combining with a to-infinitive. In any case, the untensed forms of the verb hougje ‘need’ behave like the other modals in that they combine with a bare infinitive, as in the example immediately above.

Somewhat infrequently, a modal can also be combined with a PP infinitive. Some examples are given below (Laker & Kramer 2022):

The interpretation of the examples seems to indicate that an instance of the verb of going is present in the semantic representation, more specifically, the infinitive of the verb. A construction like the West Frisian and Dutch absentive doesn’t seem to be present in Saterland Frisian.