You can click "find" and search for general terms and phrases related to ethos in the speech. Ex: "in my experience", "due to my knowledge in", "because i studied". Because you have not provided a frame of reference, I cannot specify what the answer could be.
Explanation:
Ethos, in general, can be found through a person's experiences, titles (doctor, expert, general), or the value of one's beliefs and ideas.
