The notes were sprawled across a letter bearing President Trump’s signature.

In the top left corner: “Have y’all tried grammar & style check?”

At the top right: “Federal is capitalized only when used as part of a proper noun.”

And toward the bottom: “OMG this is WRONG!”

The letter, dated May 3 and printed on White House stationery, was addressed to Yvonne Mason, 61, a former high school English teacher who retired last year but hadn’t quite left “grading-paper mode,” she said on Sunday.

So when she received the letter in the mail, she pulled out her go-to purple pen and started making corrections. Then she snapped a picture, posted the letter on Facebook and mailed it back to the White House.