Subject + 非得 + Verb Phrase + 不可
非得 (fēiděi) means "must" or "have to" with strong emphasis, indicating that something is absolutely necessary or unavoidable. It conveys a sense of insistence or compulsion, often implying the speaker feels there is no other choice.
这个任务今天非得完成不可。
Zhège rènwù jīntiān fēiděi wánchéng bùkě.
This task absolutely must be completed today.
你非得亲自去一趟才行。
Nǐ fēiděi qīnzì qù yí tàng cái xíng.
You absolutely have to go there in person.
他非得把事情搞清楚才肯罢休。
Tā fēiděi bǎ shìqíng gǎo qīngchǔ cái kěn bàxiū.
He insists on getting to the bottom of things before he'll give up.