The heart of how Greek works: the case system. We begin with the two cases in nearly every sentence — the nominative (subject) and the accusative (direct object) — and meet the second declension and the definite article. Master this lesson, and the rest of Greek grammar gets far easier.
In English, word order tells you who does what: "the dog bites the man" ≠ "the man bites the dog."
Greek does it differently. Greek tags the noun itself with an ending — a case — that announces its role: subject, direct object, possessor, indirect object. Once you read the ending, you know the job no matter where the word sits.
There are five cases. Today we focus on two, but here is where you are headed:
| Case | Core job | When |
|---|---|---|
| Nominative | Subject | This lesson |
| Genitive | Possession / source ("of") | Lesson 5 |
| Dative | Indirect object / instrument / location | Lesson 6 |
| Accusative | Direct object | This lesson |
| Vocative | Direct address | Later |
The nominative marks the subject. Every noun is listed in a lexicon in its nominative singular — so the vocab form is the nominative.
For 2nd-declension masculine nouns: nominative singular ends in -ος, nominative plural in -οι.
The accusative marks the direct object. 2nd-declension masculine accusative singular ends in -ον, plural in -ους.
In English, "God loves the world" and "the world loves God" mean opposite things. In Greek the same endings keep the same meaning whatever the order:
Greek authors move words for emphasis, not for grammar. Misread an ending and you misread the sentence.
The stem ἀνθρωπ- never changes; only the ending moves. Today we test only nominative and accusative, but see the whole set:
| Case | Singular | Plural |
|---|---|---|
| Nom | ἄνθρωπος | ἄνθρωποι |
| Gen | ἀνθρώπου | ἀνθρώπων |
| Dat | ἀνθρώπῳ | ἀνθρώποις |
| Acc | ἄνθρωπον | ἀνθρώπους |
Neuter 2nd-declension nouns have one feature you must simply memorize: the nominative and accusative are identical — both end in -ον in the singular and -α in the plural. Context tells you which case it is.
| Case | Singular | Plural |
|---|---|---|
| Nom | δῶρον | δῶρα |
| Acc | δῶρον | δῶρα |
δῶρον = "gift." Same form for subject and object — read the rest of the clause to tell them apart.
Here is something that surprises beginners: a neuter plural subject often takes a singular verb in Greek. That is not an error — Greek tends to treat a neuter plural as a single collective group, so a singular verb is normal.
So when a neuter plural subject pairs with a singular verb, don't "fix" it — that is the expected pattern. (A plural verb can also occur; context decides.)
The two paradigms share most endings. Only three cells differ:
| Form | Masc (ἄνθρωπος) | Neut (δῶρον) |
|---|---|---|
| Nom sg | -ος | -ον |
| Nom pl | -οι | -α |
| Acc pl | -ους | -α |
| (rest) | shared | shared |
Learn one paradigm well, and the other costs you only three endings.
ὁ, ἡ, τό — "the." It is the single most common word in the New Testament, and it agrees with its noun in gender, number, and case.
| Masculine | Feminine | Neuter | |
|---|---|---|---|
| Nom sg | ὁ | ἡ | τό |
| Acc sg | τόν | τήν | τό |
Read the article and you can identify the case of the noun it goes with.
The article and its noun match in gender, number, and case:
When you translate, always check: does the article match? If not, you've parsed something wrong.
A standard entry has three pieces, in order:
| Piece | Example | What it tells you |
|---|---|---|
| Lexical form | λόγος | The nominative singular (the headword) |
| Genitive ending | -ου | The declension class and the stem |
| Article | ὁ | The gender (masculine) |
So λόγος, ου, ὁ — memorize all three as one unit: "logos-ou-ho."
The nominative singular by itself can mislead you. A -ος form is often a 2nd-declension masculine like λόγος — but not every -ος-looking form belongs to that pattern. The genitive reveals the declension and the stem.
The article in the lexicon is not decoration — it tells you the noun's grammatical gender. Endings are a helpful clue, but the article is the safe answer, so don't guess gender from the ending alone.
The article tells you which article, adjective, and pronoun forms must agree with the noun later.
Equative verbs — "to be," "to become" — link two nominatives. The second is the predicate nominative.
This rule matters enormously at John 1:1.
| Step | Find | Here |
|---|---|---|
| 1 | The verb | βλέπει "he sees" |
| 2 | The nominative (subject) | ὁ ἀπόστολος |
| 3 | The accusative (object) | τὸν ἄνθρωπον |
| 4 | Assemble | "The apostle sees the man." |
For each, name the nominative and the accusative — "who's doing what to whom":
Note the dictionary format — lexical form, genitive ending, article — for every word:
Two cases, one fixed pattern, and an article that decodes them both. Every later case behaves on the same logic.
Memorize the masculine and neuter paradigms and the article forms — then the genitive (Lesson 5) and dative (Lesson 6) are short steps.