白 + Verb (in vain / for nothing)
IntroducedThe office was closed after a long trip
- office办公室to close a door关门(completed / change)了，I我in vain白to run跑(completed / change)了一趟。 The trip failed to achieve the intended office errand.
- in vain白to run跑 presents the effort as wasted for that purpose. It does not prove that no other useful or pleasant event happened on the trip.
Put in vain白 before the evaluated action
- he / him他not / haven't没to come来，we / us我们in vain白wait等(completed / change)了一个hour小时。 The expected person did not arrive, so the waiting failed in its intended purpose.
- in vain白wait等、in vain白busy忙 and in vain白to run跑 describe fruitless effort in these contexts. Read what the person hoped to achieve.
I我in vain白wait等了ages半天。
他没来，我们____等了一个小时。
白 evaluates the waiting as fruitless for meeting the expected person.
Contrast in vain白 with not in vain没白
- 这趟not in vain没白to come来，to learn (sth)学到(completed / change)了很多。 The trip was worthwhile because the speaker learned a lot.
- not in vain没白 rejects the in-vain evaluation: it was not in vain. It does not mean the person did not come.
这趟没白来，学到了很多 means…
没白 denies the in-vain evaluation, not the coming.
没白来 means 没来: the person did not come.
It means coming was not in vain.
Other uses of in vain白 need their own context
- this这顿饭to be / is是to eat without paying白吃(modifier / structural particle)的 in a stated free-meal context can mean no payment was needed. in vain白paper纸 uses in vain白 as the colour white.
- Do not force the wasted-effort reading onto every in vain白. In ambiguous accounts, clarify the intended meaning rather than counting characters.
Which meaning is stated?
Identify the meaning and evidence in each complete example.
A failed errand proves that no separate benefit occurred on the trip.
The intended errand may fail while another benefit occurs.
Match the complete example to the stated meaning.
Read the action, context and the stated evidence.
Every 白 before an action must mean wasted effort.
A stated no-payment context can support the free-of-charge reading.
An intended failure can coexist with another gain
- I我in vain白to run跑(completed / change)了post office邮局一趟，not / haven't没寄成letter信，but不过at / in在on the road路上to see见到(completed / change)了friend朋友。 The mailing errand failed, while the trip had a separate benefit.
- The extra benefit does not automatically make the first clause broken. Identify which purpose the speaker is evaluating.
我白跑了邮局，没寄成信，不过见到了朋友. Which intended task failed?
没寄成信 identifies the unsuccessful mailing purpose.
State the result you mean
- For worthwhile learning, 这趟not in vain没白to come来，to learn (sth)学到(completed / change)了很多 supplies the reason. For a failed errand, I我in vain白to run跑(completed / change)了一趟，office办公室to close a door关门(completed / change)了 supplies the failure.
- In a new example, identify the effort, intended purpose and actual result. Distinguish wasted effort, no payment and colour.
In a new example, identify the effort, intended purpose and actual result. Distinguish wasted effort, no payment and colour.
Read the full reference: HSK 5 grammar — Adverbs.
Which gives a reason why a visit was worthwhile?
The learning gain supports the positive evaluation.
Recall the situation: The office was closed after a long trip. Decide what the speaker wanted to communicate. Close the examples. Say a Mandarin response, then write it in Chinese. Explain briefly in English what the lesson’s pattern adds. Compare with the model, then change one detail and try again.
This is supported productive practice. Compare meaning and structure; your answer need not copy the model. A partner or teacher must hear the spoken response to comment on pronunciation.