complementary infinitive

A complementary infinitive is a use of the infinitive to complete the meaning of a verb. They usually occur with certain verbs.

I am able to finish this paper.The infinitive 'to finish' is the complement of the verb 'am able'.

I desire to marry this girl.The infinitive 'to marry' is the complement of the verb 'desire'.

I began to work on the project.The infinitive 'to work' is the complement of the verb 'began'.

The above infinitive phrases are called “complementary” because they are the complement of the main verb of the sentence.

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Greek:

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 takes a complementary infinitive),
επιτρεπω,
ζητεω,
θελω,
μελλω,
οφειλω.

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Hebrew:

What was said above also applies to Hebrew.  Hebrew infinitives are often complementary after the same verbs as listed above.