不知...是/才好 for “Not Know What to Do”
Use 不知怎么办才好 and 不知如何是好 to say you are at a loss and don’t know what would be best.
문형
不知 + 疑问词短语 +（才）好；不知如何是好
Put a question-word phrase between 不知 and 好 to say you don’t know which choice would be best: you are at a loss.
他帮了我这么大的忙，我真不知怎么感谢他才好。
When to use 不知...是/才好 for “Not Know What to Do”
Start with 不知, “don’t know,” then put a question phrase built on 怎么, 什么, 哪 or 如何, and finish with 好 or 才好: 不知怎么办才好, “I don’t know what would be best to do.” The 好 at the end turns a plain “I don’t know” into “I don’t know what the right choice is.”
突然下起大雨，大家都没带伞，一时不知如何是好。
It suddenly started pouring, and nobody had an umbrella. For a moment, no one knew what to do.
看到这么多礼物，小明高兴得不知说什么好。
Seeing so many presents, Xiao Ming was so happy he didn’t know what to say.
老师突然叫我回答问题，我紧张得不知说什么好。
The teacher suddenly called on me, and I was so nervous I didn’t know what to say.
两件衣服都很漂亮，她不知选哪件才好。
Both outfits were lovely, and she didn’t know which one to choose.
흔한 실수
- Keep the question word inside the pattern: 不知怎么办才好, not 不知办才好.
- With 如何, say 如何是好; with 怎么 or 什么, 好 or 才好 is the usual ending.
- Don’t add 吗: the question word already does the job, and the sentence is a statement.
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