义项
副词，表示确定或必然
Marks something as sure to happen or as an unbreakable intention: 我一定去. Note the sandhi: before a fourth tone 一 is read yí.
adverb
例句
- 你放心，我一定去。Nǐ (third tone, dipping) fàngxīn, (fourth tone, falling) wǒ (third tone, dipping) yídìng (second tone, rising) qù. (fourth tone, falling)···
Don’t worry — I’ll definitely be there.
- 努力学习，成绩一定会好。努力學習，成績一定會好。Nǔlì (third tone, dipping) xuéxí, (second tone, rising) chéngjì (second tone, rising) yídìng (second tone, rising) huì (fourth tone, falling) hǎo. (third tone, dipping)···
Study hard and your marks are sure to be good.