在 + 过去 + Time Duration
过去 (guòqù) means "the past" or "in the past." As a noun or time word, it refers to a period of time that has already elapsed. It is often used with a time duration, such as 过去两年 (the past two years), to set the temporal background of a sentence.
过去十年,这座城市变化很大。
Guòqù shí nián, zhè zuò chéngshì biànhuà hěn dà.
Over the past ten years, this city has changed a lot.
跟过去相比,现在的生活方便多了。
Gēn guòqù xiāngbǐ, xiànzài de shēnghuó fāngbiàn duō le.
Compared to the past, life is much more convenient now.
过去我不太喜欢运动,现在每天都跑步。
Guòqù wǒ bú tài xǐhuān yùndòng, xiànzài měi tiān dōu pǎobù.
I didn't like exercise much in the past, but now I run every day.