Wo bu zhidao (我不知道): I don't know in Chinese

我不知道

wǒ bù zhīdào

I don't know

Character breakdown

我

I, me

wǒ

不

not, no

bù

知

to know

zhī

道

way, path

dào

Grammar and structure

This is a simple subject-verb phrase: 我 (wǒ) means "I," 不 (bù) negates the verb, and 知道 (zhīdào) means "to know." Together it literally means "I don't know."

Variations and politeness

我不知道啊

wǒ bù zhīdào a

I don't know (with a particle) — Adds a casual, conversational tone.

我不太清楚

wǒ bù tài qīngchǔ

I'm not too clear — More polite and softer way to express uncertainty.

Mini dialogue

你知道这件事吗？

Nǐ zhīdào zhè jiàn shì ma?

Do you know about this matter?

我不知道。

Wǒ bù zhīdào.

I don't know.

When to use it

Appropriate

When you genuinely have no information or answer to a question.
In both casual and formal situations when you want to state your lack of knowledge directly.

Avoid when

When you want to soften the refusal or show politeness; English speakers often say 'I'm not sure' to be polite, but in Chinese it's more direct unless you add a softener like 不太清楚.
When you are refusing a request; saying 我不知道 might sound dismissive if the person expects you to know or help.

Frequently asked questions

How do you say 'I don't know' in Chinese?

You say 'wǒ bù zhīdào' (我不知道). It literally means 'I not know'.

How do you pronounce 'wǒ bù zhīdào'?

It's pronounced 'wǒ bù zhīdào' with the third tone on wǒ, fourth tone on bù, first tone on zhī, and fourth tone on dào. Note that bù changes to second tone before a fourth tone, but here it is followed by zhī (first tone), so it remains fourth tone.

When do you use 'wǒ bù zhīdào'?

Use it whenever you don't know the answer to a question, in both casual and formal settings. To be more polite, you can say 'wǒ bù tài qīngchǔ' (I'm not too clear).