I have done seven e-books that were either sold on the internet, or used as a purchasing incentive.
Dog For Sale: 2 year old male Great Dane. Friendly, loving, housebroken, will eat anything, especially fond of children. $250. Call 213-555-1212.
Our English language can be very confusing even without the twisting of sentences and paragraphs, leading to all sorts of miscommunications. Some of them are hilarious like the actual ad above, placed in a major metropolitan newspaper . . . others can be disastrous.
Your ads, sales letters, direct response articles, newspaper articles, e-books and other literary endeavors are too important to be assigned to the unskilled and the grammatically-challenged. You are best served using the services of a professional copywriter, particularly if you are generating income with these media.