Usages of zhǔnshí
你 今天 差点儿 错过 上课 时间， 还好 最后 准时 到 了。nǐ jīntiān chàdiǎnr cuòguò shàngkè shíjiān, háihǎo zuìhòu zhǔnshí dào le.
You almost missed class today, but luckily you arrived on time in the end.
明天 八 点 开始 上课， 大家 要 准时 到 教室。míngtiān bā diǎn kāishǐ shàngkè, dàjiā yào zhǔnshí dào jiàoshì.
Class starts at eight tomorrow; everyone should arrive at the classroom on time.
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