I just thought your readers might appreciate this passage on grammar and usage from an SAT parody book called The BSAT: http://www.bsatworld.
Thanks, Carl. I especially liked this par:
Compare "I drank too much" to "I have drunk too much." Drank is the simple past tense; drunk is the past participle. Don't confuse the two. (Also don't confuse with "I am drunk too much," the present inebriated.)