1. Your vs. You’re

This one drives me insane, and it’s become extremely common among bloggers. All it takes to avoid this error is to take a second and think about what you’re trying to say.

“Your” is a possessive pronoun, as in “your car” or “your blog.” “You’re” is a contraction for “you are,” as in “you’re screwing up your writing by using your when you really mean you are.”

2. It’s vs. Its

This is another common mistake. It’s also easily avoided by thinking through what you’re trying to say.

“It’s” is a contraction of “it is” or “it has.” “Its” is a possessive pronoun, as in “this blog has lost its mojo.” Here’s an easy rule of thumb—repeat your sentence out loud using “it is” instead. If that sounds goofy, “its” is likely the correct choice.

3. There vs. Their

This one seems to trip up everyone occasionally, often as a pure typo. Make sure to watch for it when you proofread.

“There” is used many ways, including as a reference to a place (“let’s go there”) or as a pronoun (“there is no hope”). “Their” is a plural possessive pronoun, as in “their bags” or “their opinions.” Always do the “that’s ours!” test—are you talking about more than one person and something that they possess? If so, “their” will get you there.

4. Affect vs. Effect

To this day I have to pause and mentally sort this one out in order to get it right. As with any of the other common mistakes people make when writing, it’s taking that moment to get it right that makes the difference.

“Affect” is a verb, as in “Your ability to communicate clearly will affect your income immensely.” “Effect” is a noun, as in “The effect of a parent’s low income on a child’s future is well documented.” By thinking in terms of “the effect,” you can usually sort out which is which, because you can’t stick a “the” in front of a verb. While some people do use “effect” as a verb (“a strategy to effect a settlement”), they are usually lawyers, and you should therefore ignore them if you want to write like a human.

5. The Dangling Participle

The dangling participle may be the most egregious of the most common writing mistakes. Not only will this error damage the flow of your writing, it can also make it impossible for someone to understand what you’re trying to say.

1. Loose vs. Lose

This one drives a lot of people crazy, including me. In fact, it’s so prevalent among bloggers that I once feared I was missing something, and somehow “loose” was a proper substitute for “lose” in some other English-speaking countries. Here’s a hint: it’s not.

If your pants are too loose, you might lose your pants.

2. Me, Myself, and I

One of the most common causes of grammatical pain is the choice between “me” and “I.” Too often people use “I” when they should use “me,” because since “I” sounds stilted and proper, it must be right, right? Nope.

The easy way to get this one right is to simply remove the other person from the sentence and then do what sounds correct. You would never say “Give I a call,” so you also wouldn’t say “Give Chris and I a call.” Don’t be afraid of me.

And whatever you do, don’t punt and say “myself” because you’re not sure whether “me” or “I” is the correct choice. “Myself” is only proper in two contexts, both of which are demonstrated below.

Many consider Chris a punk, but I myself tolerate him. Which brings me to ask myself, why?

3. Different than vs. Different from

This one slips under the radar a lot, and I’ll bet I’ve screwed it up countless times. It boils down to the fact that things are logically different from one another, and using the word “than” after different is a grammatical blunder.

This vase is different from the one I have, but I think mine is better than this one.

4. Improper Use of the Apostrophe

Basically, you use an apostrophe in two cases:

• For contractions (don’t for do not)
• To show possession (Frank’s blog means the blog belongs to Frank)

If still in doubt, leave the apostrophe out. It causes more reader confusion to insert an apostrophe where it doesn’t belong than it does to omit one. Plus, you can always plead the typo defense if you leave an apostrophe out, but you look unavoidably dumb when you stick one where it doesn’t belong.

5. Parallelism

Back when I talked about bullet points, one of the tips involved keeping each bullet item in parallel by beginning with the same part of speech. For example, each item might similarly begin with a verb like so:

• deliver…
• prompt…
• cause…
• drive…

When writing a list of items in paragraph form, this is even more crucial, and failing to stay in parallel can result in confusion for readers and scorn from English majors. Check out this non-parallel list in a sentence:

Over the weekend, Kevin bought a new MacBook Pro online, two software programs, and arranged for free shipping.

Do you see the problem? If not, break the list into bullet points and it becomes clear:

Over the weekend, Kevin:

• Bought a new MacBook Pro online
• Two software programs
• Arranged for free shipping

Stick the word “ordered” in front of “two software programs” and you’re in parallel. Your readers will subconsciously thank you, and the Grammar Nazis won’t slam you.

6. i.e. vs. e.g.

Ah, Latin… you’ve just gotta love it. As antiquated as they might seem, these two little Latin abbreviations are pretty handy in modern writing, but only if you use them correctly.

The Latin phrase id est means “that is,” so i.e. is a way of saying “in other words.” It’s designed to make something clearer by providing a definition or saying it in a more common way.

Copyblogger has jumped the shark, i.e., gone downhill in quality, because Brian has broken most of his New Year’s resolutions.

The Latin phrase exempli gratia means “for example”, so e.g. is used before giving specific examples that support your assertion.

Copyblogger has jumped the shark because Brian has broken most of his New Year’s resolutions, e.g., promising not to say “Web 2.0,” “linkbait,” or “jumped the shark” on the blog in 2007.

7. Could of, Would of, Should of

Please don’t do this:

I should of gone to the baseball game, and I could of, if Billy would of done his job.

This is correct:

I should have gone to the baseball game, and could have, if Billy had done his job.

Why do people make this mistake?

They could’ve, should’ve, would’ve been correct, except that the ending of those contractions is slurred when spoken. This creates something similar to a homophone, i.e., a word that is pronounced the same as another word but differs in meaning, e.g., of, which results in the common grammatical mistake of substituting of for have.

They're for their for there
No: The managers are in they're weekly planning meeting.

Yes: The managers are in their weekly planning meeting.

No: The techs have to check there cell phones at the door, and their not happy about it.

Yes: The techs have to check their cell phones at the door, and they're not happy about it.

Effect for affect
No: The outage shouldn't effect any users during work hours.

Yes: The outage shouldn't affect any users during work hours.

Yes: The outage shouldn't have any effect on users.

Yes: We will effect several changes during the downtime.

Note: Impact is not a verb. Purists, at least, beg you to use affect instead:

No: The outage shouldn't impact any users during work hours.

Yes: The outage shouldn't affect any users during work hours.

Yes: The outage should have no impact on users during work hours.

Different than for different from
No: This setup is different than the one at the main office.

Yes: This setup is different from the one at the main office.

Yes: This setup is better than the one at the main office.

Lay for lie
No: I got dizzy and had to lay down.

Yes: I got dizzy and had to lie down.

Yes: Just lay those books over there.

Then for than
No: The accounting department had more problems then we did.

Yes: The accounting department had more problems than we did.

Note: Here's a sub-peeve. When a sentence construction begins with If, you don't need a then. Then is implicit, so it's superfluous and wordy:

No: If you can't get Windows to boot, then you'll need to call Ted.

Yes: If you can't get Windows to boot, you'll need to call Ted.