古文是古代的书面语。里面有很多“之”“乎”“者”“也”。现代文都不用了。
gǔwén shì gǔdài de shūmiànyǔ 。lǐmiàn yǒu hěn duō “zhī ”“hū ”“zhě ”“yě ”。xiàndàiwén dōu bù yòng le 。
Classical Chinese is ancient written language. There's lots of “zhī”, “hū”, “zhě” and “yě” in it. Modern written language doesn't use them.