Complement clauses are nominal and function as complements of verbs, adjectives, nouns and adverbs

Complement clauses are introduced by: (a) the complementizers

ότι / πως + indicative after verbs of saying, thinking, believing

Λέει [ότι / πως την αγαπάει] Είναι σίγουρο [ότι / πως τον αγαπάει]

που + indicative after verbs expressing emotional state

Χαίρομαι [που σε γνωρίζω επιτέλους]

μήπως / μη(ν) + indicative after verbs expressing fear

Φοβάμαι [μήπως / μην έφυγε χωρίς να μου το πει] Φοβάμαι [μήπως / μη φύγεις χωρίς να μου το πει

There are certain verbs which might take either ότι / πως when the speaker wants to present the event as real or να when the speaker wants to present the event as a possibility.

Πιστεύω[ είμαι σίγουρος] ότι με καταλαβαίνεις

Πιστεύω [ελπίζω]να με καταλαβαίνεις

You can aslo read: The reflexive use of the passive

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