The structure 非…才…
"Definitely..., and only then..."
The structure 非…才… 
indicates that a certain outcome of events is possible only in certain circumstances.
A necessary condition is mentioned after 非 in the first part of a sentence. A desired outcome is mentioned after 才 in the second part of a sentence.
indicates that a certain outcome of events is possible only in certain circumstances.
A necessary condition is mentioned after 非 in the first part of a sentence. A desired outcome is mentioned after 才 in the second part of a sentence.Scheme
非
condition
才
outcome
Pay attention
If there is a subject in a sentence, it is placed either before 非 or 才.
Examples
非得大声说他才能听得清楚
In order for him to hear you, you have to speak loudly
fēi děi dàshēng shuō tā cái néng tīng de qīngchu
The modal verbs 要 or 得 are often placed after 非.
The modal verbs 能 , 可以 and 会 can are often placed after 才.
or 得 are often placed after 非.
The modal verbs 能 , 可以 and 会 can are often placed after 才.Examples
年轻人非要经过两个年的练习，才可以独立工作
Young men have to have two years of practice. Only then can they work on their own
niánqīng rén fēi yào jīngguò liǎng ge nián de liànxí, cái kěyǐ dúlì gōngzuò
这件事，非专业人士来做才能保证成功
As for this problem, specialists are needed to deal with it. Only then can we guarantee success
zhè jiàn shì, fēi zhuānyè rénshì lái zuò cái néng bǎozhèng chénggōng
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