"...a pronoun is anywhere a mouse can go…over, under, through, around and others.” I believe you mean prepositions rather than pronouns. Pronouns merely substitute for nouns, e.g., he, she, it, they, them, etc. Prepositions can be tricky. I'm multi-lingual, myself, and I can assure you that prepositions can be VERY tricky. Even in ancient Greek and Hebrew pronouns are simple. I remember the day in ninth grade when suddenly prepositions made sense, and I knew I would become an English teacher. I did teach English for a short time before I went on to do other things, but I continued language studies in graduate school, eventually earning a Ph.D. in English.
Another great chapter. These are wonderful guys.