An infinitive regularly functions as the object (or complement) of a verb. Hence, they are called complementary infinitives. The infinitive will be anarthrous. cf. BBG 32.14; GGBB p. 598. The primary clue is the verb it completes. The following verbs often take complementary infinitives:
- αρχομαι,
- βουλομαι,
- δυναμαι (always),
- επιτρεπω,
- ζητεω,
- θελω,
- μελλω,
- οφειλω.