1:I went down yesterday to Piracus with Glaucon the son of Ariston,that I might offer up my prayers to the goddess;and also because I wanted to see in what manner they would celebrate the festival,which was a new thing.(这句话中的that 是什么用法与紧跟其后的because 是有什么关系);
2:And ,my illustrious friend,do say what you think ,that we may make a little progress.
我感觉第一个that 是引导原因状语从句,第二个是目的状语从句,但是以前从未见过这种用法(是不是不常见的原因)
注:以上两句话出自Plato 的Republic 一书
Plato的 Republic(柏拉图 的 《理想国》)是一本古典哲学书 里面基本上都是正式英语