才 belongs to HSK 3 vocabulary. 才 is a conjunction.
Pinyin: pīnyīn cái
Definition: 才 means just now.
他们把迪恩就到学校了，我才半个小时了迟到了。 They already arrived at school at a quarter past eight, I was half an hour late.
2） 只有 … 才… (zhǐ yǒu …cái …)
Definition: 只有 … 才 means only if… then
只有我学习的努力 才 通过 考试。
Only if I learn ambitiously, I will pass the exam.