三人行，必有我师(焉)

语法
Sentence-ending particles
https://mandarinbean.com/modal-particles-for-beginners/
https://resources.allsetlearning.com/chinese/grammar/Sentence-final_interjection_%22a%22

词汇
古，古代, ancient (pinyin in tags)
https://mandarinbean.com/new-hsk-3-word-list/

Guardian:
我想回家啊, I wanna go home!
喂，你会不会看路啊, hey! Watch where you're going
咱们这还有这种古书啊, do we still have this kind of old book?

Me:
这个城市真大啊，我一出门就迷路。
从古到今人一直住在这里。