你怎么这么晚才到？Why are you so late?
Why are you so late? 你怎么这么晚才到？ Nǐ zěnme zhème wǎn cái dào? 1. 你 nǐ you 2. 怎么 zěn me How? 3.晚 wǎn late or night 4. 才 cái only (then), only if, just or talent, ability 5. 到 dào 1. to reach, to arrive 2. until, up to 3. to go to, to come 4. to be present (at a meeting, class, party) 5. (a particle used after a verb to indicate a completed action) 6. to (a place) Here : only (then), only if, jus Reference https://www.learnwitholiver.com/chinese/translate-sentence-3649