When it comes to examining the concepts of ethos, logos and pathos, I thought it best to look at these concepts being done well. One of the finest examples of these three appeals in play is in the essay titled Letter from a Birmingham Jail by Dr. Martin Luther King Jr.
Past tense
(You can tell it's past tense because it has the word HAD in it. It means it's already been done.)
If it were present tense, it would say "Being coached", and if it were future tense it would say "Will be coaching."
Hope this helps! :)
Without strong evidence, someone could easily nullify your argument.