Is this a book to teach English?
My wife wrote a schoolbook last fall/winter that is meant to help German students learn English. The publisher and school officials liked it so much, they hired her to write a second one for the next higher age of students.
Once again my wife hired me to help her do the research. I am going to get an iPad3 from this deal. :)
The formula we use is: Little known fun facts in English.
For example take Robin Hood, remind the readers what little they know of Robin Hood, then give them all the interesting historical facts and trivia they likely didn’t know. You can do this with carpooling and whatever else you fancy, add drawings and you have a book. You can research across the whole internet for ideas and information. I hope this is some help to you, Good Luck!
No it's not to be an English textbook per se, but an informational aid of sorts for English 1st and 2nd year students. (His wife is an English Dept graduate, and I assume he had consulted with her.)