一定 yídìng

一定（yídìng）means “certainly; definitely; must”. The adverb 一定 means "certainly/definitely. Formation: 主语 + 一定 + 会/要/是 + 动词

certainly; definitely; must

HSK2

Formation

主语 + 一定 + 会/要/是 + 动词

Explanation

The adverb 一定 means "certainly/definitely." It can express a strong guess (I'm sure it will happen) or a firm requirement (you must do it). It goes after the subject and before the verb, often with 会 or 要.

Examples

我 一定 会去。
wǒ yídìng huì qù.
I will definitely go.
你 一定 要小心。
nǐ yídìng yào xiǎoxīn.
You must be careful.

Note

The negative "definitely not" is 一定不; "not necessarily" is 不一定 (different meaning).

FAQ

一定 — what does it mean and how is it used?

certainly; definitely; must. The adverb 一定 means "certainly/definitely." It can express a strong guess (I'm sure it will happen) or a firm requirement (you must do it). It goes after the subject and before the verb, often with 会 or 要.

一定 — how do you form it?

主语 + 一定 + 会/要/是 + 动词

一定 — any usage notes?

The negative "definitely not" is 一定不; "not necessarily" is 不一定 (different meaning).

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