must; certainly 一定 yí-dìng
once 一 yí	certainly 定 dìng

must 一定要 yí-dìng yào
must; certainly 一定 yí-dìng		must; should 要 yào

must persist to the end 一定要堅持到底 yí-dìng yào jiān-chí dào-dǐ
must; certainly 一定 yí-dìng		must; should 要 yào	persist 堅持 jiān-chí		to the end 到底 dào-dǐ

You must persist to the end. 你一定要堅持到底 Nǐ yí-dìng yào jiān-chí dào-dǐ
you 你 nǐ	must; certainly 一定 yí-dìng		must; should 要 yào	persist 堅持 jiān-chí		to the end 到底 dào-dǐ

related lesson:

Let’s Talk in Chinese 60

persist to the end 堅持到底
seize the opportunity 把握機會
get help, receive assistance 得到幫助
start over again 重新開始
work hard 努力工作

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