不知...好 expresses uncertainty about what is best.
Unsure
Often with verbs
See examples below for varied real-world usage.
Not knowing what is best
- ✅ 不知該怎麼好。
- ❌ 不知怎麼。
Often with verb
- ✅ 不知說什麼好。
- ❌ 不知說好什麼。
Asked suddenly about this, I did not know how to answer.
Seeing him work so hard, I did not know what to say.
Facing this situation, everyone did not know what to do.
She suddenly cried and I did not know whether to comfort her or leave her alone.
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