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HSK 2 Complements of Quantity: Expressing the Duration of an Action
A complement of duration is a type of quantity complement placed after a verb to show how long an action or state continues. Mastering its word order requires knowing whether the verb takes an object and whether that object is a general noun or a personal pronoun.
我休息了一个小时。
Here 休息 (xiūxi) has no object, so 了 and the duration complement 一个小时 follow directly after the verb.
Read the full explanation and examples
What Is a Quantity Complement of Duration?
In the HSK 2 grammar outline, under sentence elements (句子成分) and complements (补语), the item Complements of Quantity 2 (数量补语2) covers two distinct functions, the first of which is expressing the duration of an action (表示动作持续的时间).
This lesson teaches duration phrases used as complements after a verb, answering 多长时间 (how long?). Compare 我三点下课 (I finish class at three) with 我上了三个小时课 (I had class for three hours). These are patterns for their roles here, not a rule that every time expression has one fixed position: 他一整天都在学习 uses a duration phrase before the verb as an adverbial.
Basic Word Order Without an Object
When the verb does not have an object, the word order is straightforward. The duration phrase follows immediately after the verb. If the action has already taken place or is viewed as a realized span of time, the aspect particle 了 (le) is placed right after the verb and before the duration phrase.
我休息了一个小时。
Here 休息 (xiūxi) has no object, so 了 and the duration complement 一个小时 follow directly after the verb.
Word Order Restrictions When the Verb Has an Object
With an object, learn several common patterns rather than copying one order mechanically. A duration can precede a noun object, or follow a repeated verb. Some noun objects also naturally precede the duration, as in 他学了汉语三年; that order is not universally incorrect. The choice depends on the verb, object and context. The three patterns below provide useful starting points, including separable verb–object words such as 睡觉 and 游泳.
- Pattern 1 (Insert the duration before a noun object): Place the duration complement between the verb (plus 了) and the noun object. An optional particle 的 (de) can be added between the duration phrase and the noun, especially when the duration phrase is longer.
- Pattern 2 (Repeat the verb): State the verb and object first to introduce the activity, and then repeat the verb followed immediately by 了 and the duration complement. This is very common in spoken Chinese when the object is long or when you want to emphasize the duration.
- Pattern 3 (Personal pronoun objects): A common order is Verb + (了) + pronoun + duration, as in 等了你半天. This describes this pattern, not every possible sentence: repeating the verb (等你等了半天) or placing a topicalized object earlier is also possible.
他学了三年汉语。
With a general noun object like 汉语, placing the duration complement 三年 between Verb + 了 and the object is natural and correct.
他学了汉语三年。
This order is possible: 汉语 names the activity’s object and 三年 gives its duration. Compare 他学了三年汉语 or 他学汉语学了三年. Choose the form that fits the verb and context; do not infer that every noun object must precede the duration.
妹妹看电视看了三十分钟。
Repeating the verb 看 allows the object 电视 to stay with the first verb while the duration complement 三十分钟 attaches cleanly to the second verb.
我在门口等了你半天。
This uses the common order Verb + 了 + pronoun object + duration. 半天 can mean half a day literally, or a long while in context.
Reporting a Duration and Emphasizing Duration So Far
Verb + 了 reports a realized span: 我学了三年汉语 says how long I studied, but does not by itself prove that I stopped studying. A further sentence-final 了 often emphasizes how long the situation has lasted up to the reference point, commonly now: 姐姐在北京住了两年了. Continued residence is a natural reading here; the form does not promise that she will stay indefinitely. Use the surrounding context rather than counting 了 to decide whether an activity has ended.
姐姐在北京住了两年了。
The combination of verb-le (住了) and sentence-final 了 indicates that she still lives in Beijing at the time of speaking.
Distinguishing Duration Complements from Neighbouring Complements
Because several different complements appear after the predicate at HSK 2, it is helpful to distinguish how this time-duration quantity complement differs from neighbouring structures.
- Action duration vs. Adjective + Quantity Complement: The second sub-item of Quantity Complements 2 uses an adjective plus a measure phrase (for example, 大两岁, two years older, or 高一点儿, a little taller) to show the specific margin of difference in a comparison. Even when the measure word is a time unit like 岁 (years of age), following an adjective expresses a comparison margin, whereas following an action verb expresses how long an activity lasts.
- Action duration vs. Verbal Measure Complements (动量补语): Phrases like 一次 (once) or 三遍 (three times) also follow verbs as quantity complements, but they count the frequency or number of times an action occurs, not how long a single occurrence continues.
- Action duration vs. State and Directional Complements: State complements (linked with 得, such as 跑得很快) evaluate the manner or result of an action, and directional complements (such as 走出来) show the path of movement. Neither uses time units to measure duration.
Frequently asked questions
How do I use a duration complement with words like 睡觉 (to sleep) or 游泳 (to swim)?
For separable verb–object words, useful basic patterns are inserting the duration, as in 睡了八个小时觉, or repeating the verb, as in 睡觉睡了八个小时. These patterns keep the duration’s role clear; learn them with complete examples rather than assuming that every compound or context behaves identically.
Do I always need 了 (le) with a duration complement?
No. For a routine, 我每天工作八个小时 (I work eight hours every day) needs no 了. 了 can mark an action as realized, but it is not a past-tense ending. Whether to use it depends on aspect and context, not simply on whether the English translation is past or future.
What is the difference between 三点 (three o'clock) and 三个小时 (three hours) in sentence position?
三点 is a point in time (when something happens), so it goes before the verb as an adverbial: 我三点下课 (I finish class at three o'clock). 三个小时 is a period of duration (how long something lasts), so it goes after the verb as a complement: 我上了三个小时课 (I had class for three hours).
