The Same Sound Shift That Jacob Grimm Identified Within the Germanic Family

In ancient greek, the letter p also came to represent an f sound. So we now have two different ways to represent the f sound in english. This is within a completely separate language family. But it's the same sound shift that jacob grimm had noted and identified within the germanic languages. And then there were three other changes from sounds that we don't really have in modern english oday. A very aspirated bah sound had evolved into a b sound. An aspirated da sound had become a d sound. The t sound had shifted to a t h sound. We can also see this transition from the original d sound to the t sound on words like