[Learn basic Chinese with grammar] How to use 一定 for certainty

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What does 一定 mean?

In Chinese, 一定 means “definitely,” “certainly,” or “must.” It is used when the speaker feels sure about something.

Word Basic meaning
一定 definitely; certainly; must

1. 一定 + Verb: definitely will do

Use 一定 before a verb when you are sure an action will happen.

Pattern Meaning
Subject + 一定 + Verb Subject will definitely do something
Chinese English
我一定通知你。 I will definitely notify you.
她一定參加比賽。 She will definitely join the competition.

2. 一定 + adjective: definitely is

一定 can also come before an adjective or adjective phrase to show that the speaker is sure about a situation.

Pattern Meaning
Subject + 一定 + Adjective Subject is definitely adjective
Chinese English
這件外套一定很暖。 This jacket must be very warm.
那個地方一定很安靜。 That place must be very quiet.

In this use, English often says “must be,” because the speaker is making a strong guess.

3. 一定會: will definitely

一定會 is common when talking about a future result that the speaker feels sure about.

Pattern Meaning
Subject + 一定會 + Verb Subject will definitely do something / something will definitely happen
Chinese English
這個消息一定會傳開。 This news will definitely spread.
新的設計一定會受歡迎。 The new design will definitely be popular.

一定 and 一定會 are close in meaning. 一定會 makes the future result clearer.

4. 一定要: must / be sure to

一定要 means “must” or “be sure to.” It is stronger than just .

Chinese English
你一定要帶護照。 You must bring your passport.
請一定要檢查日期。 Please be sure to check the date.

一定要 is useful when giving an important reminder.

Useful words and example sentences

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