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Punctuation Problems

Commas, semicolons, and colons.

The good news about these punctuation marks is that there is a clear set of rules telling you when to use them, where, and why.

The bad news is that knowing the rules alone aren’t enough to know how to apply them. We need to understand deeper issues of sentence structure to fully understand and use these rules.

In this video, I explain the more fundamental, core rules that you need to understand first before you can make full use of the comma, semicolon, and colon rules.

To understand sentence structure, you need to understand:

  • Clauses & phrases
  • Complete & incomplete sentences [fragments]
  • Independent & dependent clauses
  • Identifying subjects & verbs

I also discuss what doesn’t actually help

I cover sentence structure and all of the above in detail in my free Grammar courses. You can find these lessons in the SAT Writing Course and the ACT English Bootcamp.

About the Author:

I’m Rob Schombs, the founder of Reason Prep, creator of these videos, and your test prep tutor. I earned a BA in Chemistry (2006) and an MA in Science and Technology Studies (2009) from Cornell University. In 2010 I started tutoring SAT, ACT, math, chemistry, and writing full-time, and Reason Prep followed shortly after!