Differential object marking with को

Hindi marks some direct objects with को and leaves others unmarked. This is differential object marking: the object's form responds to properties such as humanness, animacy, specificity, definiteness, individuation, and the selecting verb. को is therefore neither a universal “accusative ending” nor a Hindi equivalent of English “the.” Its postpositional form is introduced separately on the को as object-marker page.

The strongest beginner baseline is reliable: personal pronoun objects and identifiable human objects normally take को; nonhuman and nonspecific objects are more often unmarked. The difficult middle must be learned as an interacting set of tendencies rather than one mechanical rule.

The structural contrast

An unmarked object is a noun phrase. A marked object is an oblique noun phrase followed by को, and the entire sequence is one constituent:

The newly introduced एक बिल्ली is unmarked and controls feminine देखी. Definite, identifiable अपनी बिल्ली को bears को and cannot control; देखा is masculine singular default after अनु ने. Case and agreement thus give two independent diagnostics of the contrast.

Pronoun and human objects

Personal-pronoun direct objects use forms that contain the को relation: मुझे, तुम्हें, उसे, हमें, आपको, उन्हें. They are never bare direct forms in ordinary object use.

Proper names and definite human descriptions likewise normally take को:

Here omission of को is not a stylistic way to sound concise. The objects are particular people, and the verbs select them as individuated patients or goals. English marks none of this overtly, so English speakers must resist treating को as optional whenever the translation lacks “to.”

Human indefinites can remain unmarked when the intended referent is nonspecific, type-like, or not yet identified:

Once the intended translator is identified, उस अनुवादक को ढूँढ रहे हैं means “we are looking for that translator.” The case contrast helps encode specificity, though context and verb meaning also contribute.

Inanimate objects are not simply “without को”

Ordinary inanimate themes commonly remain unmarked even when definite:

Hindi has no articles, and demonstrative वह already identifies the book. को is not required merely because English uses “that” or “the.”

An inanimate object can nevertheless take को when strongly individuated, contrastive, or construed as a particular target:

The paired contrast singles out two books. Marked किताब को cannot control, so पढ़ा is default. This use is natural, but marking every definite inanimate noun would be heavy and nonnative.

Commands often mark a particular target whose identity matters:

The warning selects one salient button from alternatives. Unmarked लाल बटन मत दबाइए is also possible; को heightens individuation or contrast rather than supplying definiteness from nothing.

Lexical meaning matters

Verbs differ in how naturally they combine with marked objects, so lexical selection must be learned predicate by predicate. Predicates such as जानना, बुलाना, and ढूँढना strongly favor को with an identified human, while superficially similar English predicates may select another Hindi case frame: “help Ravi” is normally रवि की मदद करना, with a genitive dependent, not रवि को मदद करना. Consumption and creation verbs often take unmarked themes. Perception verbs readily display both patterns because what is seen can be newly noticed or specifically tracked.

There is no safe English-object test that predicts both. Learn a verb with natural argument frames and examples. A dictionary gloss such as “know” or “bring” does not by itself encode Hindi object marking.

Recipients and direct objects must be separated

Recipient को in a give, send, or tell construction is strongly selected by the predicate and should not be confused with optional differential marking on the theme:

सहायक को is the recipient; unmarked feminine theme सूची controls भेजी. English can use a bare double-object construction, but Hindi does not normally say the equivalent of “sent assistant list” without को.

If a sentence contains two को phrases, lexical structure and meaning must distinguish their functions. Do not decide that the first marked phrase is automatically the only “object”; instead identify recipient, patient, goal, and theme separately.

Agreement follows case, not animacy directly

Animacy and specificity help choose को, but they do not directly select the verb ending. Once को is present, its phrase is unavailable for ordinary agreement:

In this habitual, unmarked feminine subject अध्यापिका controls पढ़ाती. In the perfective, subject ने and object को are both marked:

Masculine singular पढ़ाया is default. It does not mean that the girl or teacher is masculine. The semantic factors motivate object marking; the syntactic case configuration determines agreement.

Negation and focus reveal scope, not a new case rule

A negative indefinite often remains unmarked because no particular individual is asserted:

A specific object remains marked under negation:

Focus particle ही follows the constituent in its scope: उस सहायक को ही “that assistant in particular.” It cannot replace को, and it does not restore agreement eligibility.

Finite complements form a different kind of object

A कि-clause can supply the content of saying, knowing, or discovering, but it does not take differential object को or control matrix gender-number agreement:

Matrix बताया is default before the content clause. Inside the embedded clause, मेहमान controls पहुँच गए हैं. Adding को to कि or assigning matrix agreement from मेहमान would erase the clause boundary.

Common Mistakes

1. Omitting को with an identifiable person

2. Treating को as the definite article

3. Using a direct pronoun as an object

4. Agreeing with a को-marked feminine object

Key Takeaways

• Personal pronouns and identifiable human objects strongly require को.
• Nonspecific or type-like human objects may be unmarked; ordinary inanimate themes often remain unmarked even when definite.
• Inanimate को is possible with strong individuation, contrast, or target-like affectedness, but it is not a definite article.
• A recipient's lexically selected को must be distinguished from differential marking on a direct object.
• Semantic prominence helps select case; syntactic case then determines agreement eligibility.