Having good grammar means being able to separate fact from fiction. Here are ten popular grammar myths—how many do you believe?

• A run-on sentence is a really long sentence.
• You shouldn’t start a sentence with the word “however.”
• “Irregardless” is not a word.
• There is only one way to write the possessive form of a word that ends in “s.”
• Passive voice is always wrong.
• “I.e.” and “e.g.” mean the same thing.
• You use “a” before words that start with consonants and “an” before words that start with vowels.
• It’s incorrect to answer the question “How are you?” with the statement “I’m good.”
• You shouldn’t split infinitives.
• You shouldn’t end a sentence with a preposition.

Before you write in to express your outrage, read our full debunking of each myth.