一定

yī dìng

surely, certainly, necessarily, fixed, a certain (extent etc), given, particular, must

我有订阅

wǒ yǒu dìng yuè

I have a subscription

请你解释一下你的决定。

qǐng nǐ jiě shì yī xià nǐ de jué dìng。

Could you please explain your decision.

我同意你的决定

wǒ tóng yì nǐ de jué dìng

I agree with your decision

他的决定让我很困惑

tā de jué dìng ràng wǒ hěn kùn huò

His decision confuses me

我肯定这个计划会成功

wǒ kěn dìng zhè ge jì huà huì chéng gōng

I'm sure the plan will work

我们必须搞定这个问题。

wǒ men bì xū gǎo dìng zhè gè wèn tí。

We have to fix this problem.

她已经决定工厂辞职了。

tā yǐ jīng jué dìng gōng chǎng cí zhí le。

She has decided to resign from the factory.

我决定要辛勤地学习汉语。

wǒ jué dìng yào xīn qín de xué xí Hàn yǔ。

I decided to study Chinese hard.

说不定今天晚上我会加班，等我回家可能会很晚。

shuō bu dìng jīn tiān wǎn shang wǒ huì jiā bān， děng wǒ huí jiā kě néng huì hěn wǎn。

Maybe I will work overtime tonight, and it may be very late when I get home.

我想做一个医生

wǒ xiǎng zuò yī gè yī shēng

I want to become a doctor