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plCommon Errors
The adverb 就 can serve several functions in a sentence, and its meaning depends heavily on context.
1. Incorrect position
As an adverb, when 就 appears in the second clause of conditional sentences echoing the conjunctions 如果 or 要是 ‘if’ placed in the first clause, it cannot appear before the subject of the main clause when there is an overt one.
*如果明天天气很好，就我们去公园跑步。
如果明天天气很好，我们就去公园跑步
*如果明天天氣很好，就我們去公園跑步。
如果明天天氣很好，我們就去公園跑步。
It is the same if 就 appears in the pattern 一…… 就…… ‘as soon as…, then…’, and the two actions are performed by two different people.
*新老师一说话，就学生们想笑。
新老师一说话，学生们就想笑。
*新老師一說話，就學生們想笑。
新老師一說話，學生們就想笑。
2. Omission
When 就 expresses that one action happens ‘right after’ another, the learners may forget to place the particle 了 or to use a complement to indicate that the first action is completed.
*我吃饭就回家了。
我吃完饭就回家了。
*我吃飯就回家了。
我吃完飯就回家了。
When 就 appears in the pattern 一…… 就…… ‘as soon as…, then…’, 一 can be omitted if the verb phrase is a verb–object phrase, but if it is not a verb–object phrase, 一 cannot be omitted.
*她学就会.
她一学就会.
他吃完饭就去公园。
他一吃完饭就去公园。
*她學就會.
她一學就會.
他吃完飯就去公園。
他一吃完飯就去公園。
3. Misuse of modal particle 了 in imperative and suggestion sentences
Learners may incorrectly add the modal particle 了 in imperative or suggestion sentences. In these contexts, the actions have not yet taken place, but the modal particle 了 presents the situation as already established, which creates a pragmatic conflict.
*你今天身体不舒服，吃了药就去睡觉了。
你今天身體不舒服，吃了藥就去睡覺了。
你今天身体不舒服，吃了药就去睡觉 (吧)。
你今天身體不舒服，吃了藥就去睡覺 (吧)。
4. Confusion between 就 and 才
Both 就 and 才 can link two verb phrases to show that one event happens after another. However, they express opposite temporal relations: 就 indicates that the second action happens ‘right after’ the first, with a short interval; 才 indicates that the second action happens ‘only after’ the first, with a long or unexpected delay.
他做完作业就来到我家了。
他做完作業就來到我家了。
他做完作业才来到我家。
他做完作業才來到我家。
When 了 appears at the end of the sentence after 就, it indicates that the action following 就 has also already taken place. In contrast, the modal particle 了 is optional with 才: without 了, the sentence presents the event as part of a completed sequence; with le 了, the speaker places additional emphasis on the result as a newly realized or noteworthy outcome.
等了一会儿，医生就来了。
等了一會兒，醫生就來了。
等了很久，医生才来。
等了很久，醫生才來。
等了很久，医生才来了。
等了很久，醫生才來了。
5. Confusion in expressing later or earlier time
When a time reference is present, its position changes the meaning: if placed before 就, it implies that the action occurred or was completed earlier than expected; if placed after 就, it implies that the action occurred or was completed later than expected.
你下午五点就吃晚饭了。
你下午五點就吃晚飯了。
你吃午饭的时候就下午三点半了。
你吃午飯的時候就下午三點半了。
6. Inappropriate usage of the pattern 一…… 就……
This pattern expresses that one action happens immediately after another, meaning ‘as soon as…, then…’. If there is a short interval between the two actions, this structure cannot be used.
*他们俩一认识就结婚了。
他们俩认识不久就结婚了。
*他們倆一認識就結婚了。
他們倆認識不久就結婚了。
7. Pragmatic errors
Note that when 就 precedes a verb followed by a quantity, the context determines whether the quantity is perceived as small or large.
买这本书，你就花了二十块钱。
買這本書，你就花了二十塊錢。
修这辆车，就花了三千块钱。
修這輛車，就花了三千塊錢。
Classroom activity：Imagine and complete.
pairs or whole class.
10 minutes.
images or sentence prompts on the board.
- The teacher writes several incomplete sentences on the board and shows related images, such as:
如果我是一条鱼，我就……/如果我是一條魚，我就……;
如果忘了做作业，我就……/如果我是一條魚，我就……;
如果爸爸生气了，我就……/如果爸爸生氣了，我就……;
如果我会飞，我就……/如果我會飛，我就……;
如果明天天气不好，我就……/如果明天天氣不好，我就……
- The teacher reviews the structure 如果……，就…… with one oral example.
- Students work in pairs or think individually to complete each sentence with a simple result clause.
- Students say their completed sentences aloud.
- The teacher invites a few students to share their ideas with the class.
- The teacher gives brief feedback and confirms correct use of the hypothetical structure.