隧道工程原定三月开工,却因地质勘探不足被迫延期。Suìdào gōngchéng yuándìng sān yuè kāigōng, què yīn dìzhì kāntàn bùzú bèipò yánqī.The tunnel project was originally scheduled to start construction in March, but was forced to be postponed due to insufficient geological surveys.
春节过后,工厂初八就开工了。Chūnjié guòhòu, gōngchǎng chū bā jiù kāigōng le.After the Spring Festival, the factory started work on the eighth day.
工人们天一亮就开工,中午才休息。Gōngrénmen tiān yí liàng jiù kāigōng, zhōngwǔ cái xiūxi.The workers start work as soon as it is light and only rest at noon.