Grammar tip: That vs. which

Here's a mistake that I see a lot -- folks using "which" when they should be using "that."

So how do you know which one to use?

Ask yourself; is the information that follows "that" or "which" essential to the sentence? In other words, is the information vital to understanding the sentence? If it is, use "that." If it's not, use "which."

In most cases, you need to use a comma before "which" and a comma after the phrase you are adding.

Some examples:

Grammar tip: Might versus may

"May" implies permission to do something:;

My parents said I may go to the prom.

My mom said I may not wear my torn jeans to school.

      

"Might" means that something is possible: 

The school board might vote to allow torn jeans in school. 
I might get an interview with George Clooney.