The number of copies sold is statistically difficult to determine.
Explanation:
The determination of the number of books sold by a particular author is a <em>difficult task</em> going by the fact that, most of the sale are made online and at various stores. <em>Most of the customers that bought the books hardly leave feedback which would have aided in compiling the total number.</em>
Also, <em>some are sold as hard copies at various stores</em> available within the author's country of residence and outside of it.
In summary, while looking at the Amazon website, I am optimistic that the author, Artwoodwrite was able to sell a substantial amount of the book Brain friction (Wondering of the mind).
Adverbs of time tell us when an action happened, but also for how long, and how often. Adverbs of time are invariable. They are extremely common in English. Adverbs of time have standard positions in a sentence depending on what the adverb of time is telling us
Cliché would best describe a stock character because they are known to be stereotypical and flat, and very predictable. Stock characters are not necessarily wicked, and are the opposite of unpredictable.
Answer: Getting older means getting closer to the end of your life which means that they try to spend more time with the people they want to and pursue thing that they always wanted to do.