原本 + Clause (implying contrast)
原本 (yuánběn) means 'originally,' 'formerly,' or 'original' and is used to describe something as it was before a change occurred. It often implies a contrast between a prior state and the current situation.
这栋楼原本是一座工厂,后来改成了咖啡馆。
zhè dòng lóu yuánběn shì yī zuò gōngchǎng, hòulái gǎichéngle kāfēiguǎn.
This building was originally a factory and was later converted into a café.
我原本打算周末去爬山,结果下雨了。
wǒ yuánběn dǎsuàn zhōumò qù páshān, jiéguǒ xiàyǔ le.
I originally planned to go hiking on the weekend, but it rained.
他原本不喜欢吃辣,来了四川之后慢慢习惯了。
tā yuánběn bù xǐhuān chī là, láile Sìchuān zhīhòu mànmàn xíguàn le.
He originally didn't like spicy food, but after coming to Sichuan he gradually got used to it.