There are several common grammatical mistakes that haunt everyone: even writers. In order to overcome this grammatical wasteland, you have two choices.
1. You can spend endless time studying, learning and relearning in order to become the world's next great grammarian... OR
2. You can take a look at this quick and easy cheat sheet whenever you have doubts about the the way you've used the words which, that, who, whom, its, it's, whos, or whose. Or if you an unsure about one of those pesky semi-colons
Included in the graphic above are some of the most common grammatical mistakes that people make in writing everyday, and was created and complied by a group of English 304 (Technical Editing) students at West Virginia University.