The first is good grammar, the second is good judgment.

NEWYORKER: The English Wars

The Offense : You're in a splendid message volley with an angel, a gorgeous brunette with clever jokes and exceptionally good spelling and grammar skills.

CNN: Don't be offended by online-dating rejection

Specific marks are being allocated for good spelling, punctuation and grammar - a change that affects exams in English literature, geography, history and religious studies taken since January this year.

BBC: Education & Family

Grammar is clearly good for promotability as well.

FORBES: Report: How Grammar Influences Your Income

West Kent's grammar schools are so competitive and so good that several fee-paying primary schools have sprung up to prepare pupils for the tests a phenomenon vanishingly rare elsewhere.

ECONOMIST: Grammar schools

Every one of the 117 pupils entered for GCSEs at Colyton Grammar School in Devon got at least five good grades including English and maths, achieving the best results for GCSEs in England.

BBC: Schools celebrate league table success

"Clarity is the most important characteristic of good business writing, " says Mignon Fogarty, creator of the "Grammar Girl Quick and Dirty Tips for Better Writing" podcast.

FORBES: Magazine Article