There's a simplicity to the English language that makes it easier than most to learn, but with every language there are challenges that can make the victims of errors look foolish. Even the most well-spoken people can often say something that is technically incorrect just as the most gifted writers sometimes type mistakes that get caught by their readers... if their editors didn't notice first.
Here are 15 of the most common. Learn them and avoid the dreaded correction from a cohort.