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. mixing up your/you're, there/their/they're, and ending a sentence with a preposition.

— Dave N (@RunnerDave20194)

It's and its. One is a contraction, the other is a possessive. Happy Grammar Day from a Middle School Language Arts teacher.

— Julie Yanchulis (@DCSportsMom)

when people say they will "try and" do something. Should be try TO!

— Dana Tofig (@MCPSPIO)

Person's who make thing's plural by adding apostrophe's. And of course possessive's to. Totally anger's me. Learn the rule's, folk's.

— Doug Kern (@dakern74)

Who/whom and subject/verb disagreement. "Data" and "media" are PLURALS, people! :-)

— Deb Stahl (@CrnchyMama)

"Lose" & "Loose"

— 9_Passion (@Sov_Passion)

When people on Facebook use .... instead of commas, semicolons, or periods between sentences when they write long posts.

— kerrin (@kerrinsuzanne)

When people say "Him and me" went out. It should be "he and I".

— Mary Ellen (@m_icaza)

many are orthographic errors. I despise the misuse of "then" and "than"

— Petworthian (@Petworthnewvie)

How about him and me and her and I ugh.

— Andrea Warwick (@andiw516)

Use FEWER with items that can be counted; use LESS with a quantity of a substance.

— Heather Hurley (@medevam)

Using "lay" instead of "lie" and "went" instead of "gone."

— Sash (@michael0501)

when apostrophe "s" (or 's) is used as pluralization for a word or acronym

— Neal G. (@PalmBay925)

It drives me crazy when people say "physical" when they mean "fiscal"

using ARE for OUR

— HelenPriceMontgomery (@hporiginal)

oh! And "should/would/must of" instead of "should/would/must have"

— Petworthian (@Petworthnewvie)

Hate when people confuse there, their and they're. I mean, come on, there only 3 options! Their needs to be more focus on grammar.

— Anneliese Delgado (@OnAirAnneliese)

I'm sure you will get "alot" of replies RT Wednesday is National Grammar Day! What are your top grammar pet peeves? Tell us with

— Rebecca Roth (@rebroth)

the obvious one to me is your-you're

— George Daffan (@GCD04)

People who say "send it to John Doe and I" or otherwise misuse "I" because they think it sounds smarter.

— Satirical Alexandria (@SatirclAlx)

Hi . Knock knock. Who's there? To. To who? To WHOM! Happy !

— Stacey Viera (@staceyviera)

Typo issues: form & from; weather & whether... Grammar issues: your & you're; their & there; to & too; and when to use "," and ";"

— wendy (@wowindc)