I imagine this has already been suggested but searched and couldn't find it.
In Sentences, you are given a bunch of sentences but only one usage of each, I think it would be better to have variation such as different names appearing instead of just マイケルさん.
Sorry - a lot of them got entered in when my wife was coming up with the sentences for a few sections (laughs).
Doing this is much more difficult than you might think - it would void the usefulness of audio attached to sentences, and then it would need to be a human-picked pool of words to make sure they can *all* go into any given sentence naturally.
On top of that, the English translation would also become incorrect, including the possibility of gendered pronouns in other parts of the sentence.
