How to Say "Of Course" in Chinese

The most common neutral way to say “of course” is 当然 (dāngrán). In conversation you can add 了 or 那 for a warmer or more emphatic tone.

The most common way

dāngrán

Of course; naturally — the neutral, general reply or tag.

How to say it: Keep dāng high and level and let rán rise; give both syllables clear weight instead of rushing them into English “dang-ran.”

casual
dāngrán le
Of course! — a more conversational, slightly warmer or more emphatic yes.
When to use it: Use it with friends, classmates or colleagues when agreeing in a friendly, spoken way.
emphatic
nà dāngrán
Of course — often with a tone of “that goes without saying”; can sound a little emphatic or smug.
When to use it: Use it when the answer is obvious and you want to stress it, especially in informal conversation.
polite
dāngrán kěyǐ
Of course you can; certainly — a polite yes to a request or permission question.
When to use it: Use it when granting permission or agreeing to a request in a courteous, everyday way.
colloquial
nà hái yòng shuō
Need I say it? / Obviously — strongly implies the answer is too obvious to question.
When to use it: Use it with people you know well when the answer is clearly yes; it can sound blunt or smug in formal settings.
slang
bìxū de
Absolutely; definitely — informal, upbeat agreement, literally “it’s a must.”
When to use it: Use it among friends or in casual chat when enthusiastic agreement is wanted; avoid it in formal writing or with superiors.