Biblical Greek grammar reference for the Greek New Testament
A working reference for the grammar you actually meet while reading the Greek New Testament: the four noun cases, the Koine verbal system of tense-aspect, voice, and mood, participles and infinitives, and the article, pronouns, and particles that hold sentences together. Every topic is tied to real parsed verses in the SBLGNT reader, so grammar stays connected to the text instead of living in isolated tables.
The grammar you meet while reading
New Testament Greek is an inflected language: a word's job in the sentence is signaled by its ending, not primarily by word order. That makes morphology the heart of the grammar. The reference is organized the way the text presents itself — by the parts of speech and the forms that recur on nearly every page — so you can look up a case ending or a verb form the moment a verse forces the question.
Noun cases
Nominative for the subject, genitive for source and relationship, dative for the indirect object and means, and accusative for the direct object — with the endings across the major declensions.
The verbal system
Tense-aspect, voice (active, middle, passive), and mood (indicative, subjunctive, imperative, optative). The present, imperfect, future, aorist, and perfect, with their personal endings.
Participles & infinitives
The verbal adjectives and verbal nouns that drive Koine syntax: how participles agree, how they relate temporally to the main verb, and how infinitives complete and complement.
Article, pronouns & particles
The definite article and its agreement, the pronoun systems, and the conjunctions and particles such as δέ, γάρ, and οὖν that signal how clauses connect and arguments unfold.
How tense and aspect work in Koine
The single most useful idea in the Greek verb is that it primarily encodes aspect — the way the author chooses to portray an action — rather than the time when it happened. The present and imperfect use the imperfective aspect and view an action as ongoing or in progress. The aorist uses the perfective aspect and views an action as a complete whole, without comment on its internal unfolding. The perfect presents an action as having produced a standing result. Time as such is signaled mainly in the indicative mood; outside the indicative, the contrast between, say, a present and an aorist subjunctive is one of aspect, not of past versus future.
This is why aspect matters more than time for reading. When you meet an aorist participle, the question is not merely "when," but "how is the writer framing this — as a whole event, often prior to or coincident with the main verb?" Grasping the imperfective–perfective contrast lets you read the difference between "he was knocking" and "he knocked," or between an ongoing command and a command to do something once, with the precision the Greek itself carries.
Grammar tied to real parsed verses
A reference only helps if it connects to what you are reading. In HackGreek, the grammar pages link the same morphology you study to live examples in the Greek New Testament reader. Tap any word in the SBLGNT text and the study pane shows its lemma, full parsing, and gloss, so an abstract category like "aorist middle participle" becomes a concrete form sitting in an actual sentence. The companion word-structure reference goes a level deeper, breaking surface forms into stem, connecting elements, and endings so you can see why a word looks the way it does. Reading, parsing, and grammar reinforce one another instead of staying in separate silos.
Frequently asked questions
What grammar do I need to read the Greek New Testament?
You need the core of first-year Koine: the four noun cases and their endings, the article, the present and aorist verb systems with their voices and moods, and how participles and infinitives work. The HackGreek grammar reference organizes exactly these topics around the forms you actually meet in the SBLGNT text, so you can read first and look up the details as they come up.
Is this Koine or Classical Greek?
It is Koine — the common Greek of the first-century Mediterranean world and the language of the New Testament. The reference is built around the SBL Greek New Testament (SBLGNT), so the paradigms, vocabulary, and example sentences reflect Koine usage rather than the more elaborate Classical Attic of several centuries earlier.
How does Greek verb aspect work?
Greek verbs primarily encode aspect — the author's view of an action — rather than absolute time. The present and imperfect use the imperfective aspect, viewing an action as ongoing or in progress; the aorist uses the perfective aspect, viewing it as a whole; and the perfect presents a resulting state. Time is mainly signaled in the indicative mood, which is why aspect, not tense, is the better first question to ask of any verb.
Do I need to memorize all the paradigms?
Not all at once. You will internalize the most frequent endings quickly just by reading, because the same forms recur on nearly every page. The reference and the reader's tap-to-parse feature let you confirm a parsing the moment you need it, so you can build the high-frequency paradigms into reflexes through repeated exposure instead of front-loading every table.