Transitive and Intransitive Predicates

A transitive predicate presents an action or relation with a direct object: Tôi ăn cơm “I eat rice,” where cơm is what is eaten. An intransitive predicate does not take a direct object: Chị ấy đến “She arrives.” Vietnamese marks neither type with a special ending, so learners must know a predicate's usual participants and read the clause in context.

The distinction is about argument structure, not the visual length of a sentence. An intransitive predicate may be followed by a time, place, direction, or manner expression, while a transitive object may be omitted when it is understood. Some predicates also alternate between frames with no change in form. Stative versus dynamic meaning is a separate question, developed on Stative and Dynamic Predicates.

The basic contrast

In the first sentence, cơm is the direct object of ăn. In the second, ga is a destination associated with đến, not an entity affected by arrival. English arrive at the station uses a preposition; Vietnamese đến ga uses its own lexical frame. Transitivity cannot be determined by translating one English word at a time.

Transitive predicates and their objects

Common transitive predicates include ăn “eat,” mua “buy,” đọc “read,” thấy “see,” and làm “do/make.” Their object normally follows them.

The object is not marked by a case ending. Word order, meaning, classifiers, and discourse identify it. In Tôi thấy anh Nam, the experiencer tôi precedes the predicate and the perceived person anh Nam follows it.

Some transitive predicates select a more specific complement structure. Cho can express transfer and combine with a theme and recipient; nói may be followed by content or a phrase headed by với when the interlocutor is expressed. These patterns must be learned lexically. English prepositions are not a safe template.

Intransitive predicates can still have material after them

An intransitive predicate may be followed by an adjunct of place, time, manner, reason, or direction.

Rất nhanh, từ sáng sớm, and trên ghế sofa do not become direct objects merely because they follow a predicate. Remove them and chị ấy đi, khách đến, and em bé ngủ remain complete basic predications.

Property predicates such as Trời lạnh are also one-place predicates: they attribute a state to a subject and take no direct object. Nominal predication with là is different again: in Cô ấy là giáo viên, giáo viên identifies the subject rather than functioning as an affected object.

Here là kiến trúc sư is an identifying predicate. Làm kỹ sư uses làm in the sense “work as,” with a role complement. Neither should be analyzed mechanically as English be plus direct object.

Object omission does not automatically make a new verb

Vietnamese readily omits an object when the context makes it obvious or when the activity matters more than the affected thing.

No food noun is expressed, but ăn still evokes its familiar eating frame. The reply is natural because the understood object is a meal or food in general. Compare Tôi đang đọc “I'm reading,” where the book or text is irrelevant, with Tôi đang đọc báo cáo “I'm reading the report,” where the object is informative.

This is often called object omission or an absolute use of a transitive predicate. It differs from a change-of-state alternation such as Cửa mở, where cửa is the subject undergoing the opening rather than an unspoken object.

Same form, two frames: ambitransitivity

Some Vietnamese predicates appear transitively and intransitively without a visible derivational marker. The participants determine the reading.

In Cửa mở, the affected entity is the intransitive subject. In Tôi mở cửa, an agent is added and the same entity becomes the object. With dừng, chiếc xe stops in the intransitive clause, while tài xế causes xe to stop in the transitive clause. The unchanged form does not mean the two structures are identical; the argument mapping has changed.

Not every predicate permits this alternation. Ngủ “sleep” does not ordinarily mean “put someone to sleep” simply by adding an object. Vietnamese may use a causative expression such as làm cho em bé ngủ or the lexical verb ru “lull.” This is why valency must be learned word by word.

Có: possession versus existence

The pair required for everyday use also demonstrates how word order and discourse assign roles:

In the possessive clause, tôi is the possessor and một câu hỏi is what the possessor has. In the existential clause, the location ở đây sets the scene and Wi-Fi miễn phí is introduced as present. Some analyses describe these structures differently, but the learner-facing distinction is clear: possessor-first có expresses having; location-first có commonly presents existence or availability.

Aspect and voice words do not change valency by themselves

Adding đã, đang, or sẽ does not conjugate the predicate or automatically change its object frame:

The objects remain bài tập and phim. Voice-related được and bị can introduce an affected-subject construction, often with positive/favorable versus adverse implications, but they are separate words and their interpretation depends on the larger clause.

The underlying actions still involve someone who praises or reminds and someone affected. Vietnamese reorganizes their presentation with được or bị; it does not add a passive ending to khen or nhắc.

A natural contrast in context

The dialogue contrasts intransitive cửa mở with transitive bảo vệ mở cửa, intransitive khách đến, existential có người, and two contextual uses of dừng xe. Argument structure—not verb shape—tells the listener who acts and what is affected.

Quick decision aid

1. Does the predicate select something directly affected, perceived, created, or consumed? Expect a transitive frame: ăn cơm, thấy Lan, làm bài tập.
2. Does the clause present one participant moving, arriving, sleeping, or holding a property? Expect an intransitive/one-place frame: chị ấy đi, khách đến, em bé ngủ, trời lạnh.
3. Is the following phrase a place, time, manner, or reason? It may be an adjunct, not an object.
4. Is an expected object recoverable from context? Vietnamese may omit it: Tôi ăn rồi.
5. Does the affected entity become the subject with the same form? Check for a genuine alternation: Tôi mở cửa / Cửa mở.
6. Learn exceptional complement and preposition patterns with each predicate rather than copying English.

Common Mistakes

1. Treating every phrase after a predicate as a direct object.

Position alone does not determine objecthood; semantic role and lexical frame matter.

2. Forcing an object after a transitive predicate when context supplies it.

Vietnamese freely omits a recoverable object.

3. Inserting là before a property predicate.

Lạnh is a one-place stative predicate, not a noun requiring là.

4. Copying an English preposition into the Vietnamese frame.

Learn đến + destination as a Vietnamese complement pattern. Tại has formal locative uses, but it is not required simply because English says at.

5. Assuming every intransitive predicate becomes causative by adding an object.

Ngủ does not freely alternate like mở or dừng; Vietnamese uses an appropriate causative or lexical predicate.

Key Takeaways

Transitive predicates select a direct object; intransitive predicates do not. Vietnamese signals the distinction through lexical meaning, participant roles, and word order rather than conjugational morphology. Objects may be omitted, adjuncts may follow intransitive predicates, and some forms such as mở and dừng participate in genuine alternations. Learn each predicate together with its argument and complement frame.