This is the 8297th most frequent Chinese word.
ken
The Chinese word "肯" ("kěn") means "willing," "agree," or "to consent."
In this sentence, '愿意' (yuànyì) uses '肯' (kěn) as a synonym, expressing willingness or agreeability.
你愿意帮助我吗？
Are you willing to help me?
Here, '肯' (kěn) denotes the attitude of willingness or determination to put forth effort.
只要你肯努力，就一定会成功。
As long as you are willing to work hard, you will definitely succeed.
In this usage, '肯定' (kěndìng) combines '肯' (kěn) and '定' (dìng) to mean certainty or affirmation.