Two complete sentences joined with just a comma. Here's why that doesn't work and three ways to fix it.
Two sentences jammed together with no punctuation at all — the comma splice's more extreme cousin.
Not a grammar error, but it hides who's responsible. Here's when to fix it and when to leave it.
Yes — one of the most widely taught grammar "rules" isn't actually a rule. Here's the real story.
"Either" is grammatically singular, even though it always refers to two things. Here's why.
Two negatives cancel out in standard English — often not the meaning the writer intended.
My vs. me, their vs. them, its vs. it — how to tell which form a sentence needs.
"A well-known actor" or "a well known actor"? The one consistent rule behind compound modifiers.