Note 16 — THE VERB.
Reading edition
Analogy has no doubt played a great part in the development of these constructions, but they clearly have their origin in the use of the participle as a substantive, just like the infinitive. Compare Minä toivon saada rahoja with Minä luulen saavani rahoja and Miehet nayttävät tulevan with Miehet taitavat tulla. Compare such Turkish constructions as كلديكمى بلدكز geldiyimi bildiniz, you knew I had come.