Expressing not knowing how to do something using "hao"

"不知道⋯⋯好" (bù zhīdào... hǎo) is an expression used to indicate and emphasize that the speaker does not know how to do something, or at least does not know how to do something well.

The structure is remarkably simple:

Subject + 不知道 + Verb Phrase + 好

You will sometimes see the adverb 才 preceding the final 好, which serves the purpose of emphasis.

Here are some examples of this pattern:

• 他 不 知道 怎么 选择 好。
• 我 不 知道 怎么 说 好。
• 当时，我 真的 不 知道 怎么 办 才 好。

Sources and further reading

• SOURCES NEED TO BE ADDED