Today’s Tuesday Tip comes straight from Grammar Girl herself at www.quickanddirtytips.com.
“Then” has an element of time. For example, it can mean “next” or “at that time.”
“Than” conveys a comparison.
Quick and Dirty Tip: Both “than” and “comparison” have the letter “a” in them, and “then” and “time” both have the letter “e.”
Check out the entire post, including some examples, by clicking here:
http://www.quickanddirtytips.com/education/grammar/then-versus-than
Then vs. Than
