A retired high school English teacher says a letter she received from President TrumpDonald John TrumpFive takeaways from Cruz, O'Rourke's debate showdown Arpaio files libel suit against New York Times IMF's Christine Lagarde delays trip to Middle East MORE would have barely earned passing marks, so she corrected the letter and sent it back to the White House. 

Yvonne Mason, an Atlanta resident who retired last year after teaching middle and high school students in South Carolina for 17 years, corrected grammatical mistakes in the letter bearing Trump's signature, including 11 instances of improper capitalization of words like "president" and "state." 

"If it had been written in middle school, I'd give it a C or C-plus," Mason told South Carolina's Greenville News. "If it had been written in high school, I'd give it a D."

She did not attach a letter grade to the letter she sent back to the White House. 

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Mason acknowledges the letter was likely written by a staffer. She received it after penning a letter requesting that Trump meet individually with the families who lost loved ones in the Feb. 14 high school shooting in Parkland, Fla. 

"When you get letters from the highest level of government, you expect them to be at least mechanically correct," she told the newspaper. 

"It's stylistically appalling," she added, comparing Trump's writing to the "exquisite" letters she's received from South Carolina Sen. Lindsey GrahamLindsey Olin GrahamSaudi mystery drives wedge between Trump, GOP Suspects in journalist's disappearance linked to Saudi crown prince: report Overnight Defense: Trump worries Saudi Arabia treated as 'guilty until proven innocent' | McConnell opens door to sanctions | Joint Chiefs chair to meet Saudi counterpart | Mattis says Trump backs him '100 percent' MORE's (R) office. 

The teacher said the White House response did not address her request specifically. 

Trump previously held a "listening session" with Parkland community members and the victims' parents to discuss the prevention of school shootings and gun violence.