Oooh, I love this series. I also adore the level of detail you've put into 'making' Gallifreyan and in representing how someone would learn it. Like this bit:

"'Accompany me at this moment in this direction,'" she said. It was clear she was quoting. "Using the familiar tense, so it's clear I mean 'walk with me,' not 'follow me'."

...I want to see Rose's next lesson... ;)