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Using 了…（就）… to Link Actions and Results
This lesson explains how 了…（就）… links an action or event with a following action or result, and how to choose between versions with and without 就.
我明天做完了作业就回家。
明天 makes this a future plan. 了 presents homework completion before going home; it does not make that completion a past fact.
Read the full explanation and examples
Meaning: one event leads into the next
The outline lists ……了……（就）…… as a condensed pattern linking an earlier event with what follows. 了 presents the first event as bounded or completed relative to the following event, not necessarily completed before speaking. It can appear in a past account, a habit, or a future plan. Optional 就 often makes the follow-up more direct; it does not specify an exact number of seconds. The outline establishes the lesson’s scope and level, not a test centre’s current exam version.
我明天做完了作业就回家。
明天 makes this a future plan. 了 presents homework completion before going home; it does not make that completion a past fact.
他到了北京就给家里打电话。
The sentence links arrival with the following action; the exact timing depends on context.
How to form it
Common first-event forms include 吃了饭 and 做完了作业: 了 follows the verb or result-complement unit before the object. Do not mechanically append 了 after an entire verb phrase in every sentence. Then state the following action, with optional 就. In the common shared-subject version, one subject covers both actions; if the second needs its own subject, place that subject before 就. Tight phrasing matters for the condensed form, while expanded versions can also be valid.
我们吃了饭去图书馆学习。
This example omits 就 and presents the meal before the planned library visit. Context supplies the plan reading.
下了雨，大家就开得很慢。
The first part is an event, and the second part gives a resulting response.
When to use it, and what it does not mean
Use this pattern for a close event-and-follow-up relationship, not merely because a sentence contains 了. The final example includes 以后 to make “after” explicit and is an expanded comparison. Its final 了 in 好多了 marks an improved state, separate from the earlier 了 in 看了医生. Question force comes from a suitable question form, not from 了 or 就 alone.
我看了医生以后就觉得好多了。
The earlier 了 marks the event; 好多了 means “much better.”
- A plain sequence such as “I finished the work. I went home” reports two events separately. The compact pattern links the second part to the first.
- The pattern does not mean only “immediately.” 就 can make the progression feel direct, but the situation determines how much time passes.
- A future or conditional reading is possible: 我明天做完了作业就回家 has not happened yet. 了 is not a general past-tense marker.
A practical way to build your own sentence
First choose the earlier event and its following action. Use a natural first-event phrase, such as 吃了饭, and add the follow-up with optional 就. Then check the timing from context: 明天 supports a future plan, while a past account can describe two completed events. Do not infer past tense from 了 alone. The relationship should be clear enough for compact phrasing; add more context or a fuller structure when needed.
Frequently asked questions
Can I leave out 就?
Yes. The supplied pattern marks 就 as optional. Including it often makes the progression from the first event to the next action or result more direct.
Does 就 always mean that the next action happens immediately?
No. It often presents the next part as a direct follow-up, but context determines the actual timing.
Does this pattern itself make a sentence a question?
No. The listed form expresses a link between events; question meaning would come from the wider sentence and context.
