Other words that are commonly misused
bad = describes a person, place, thing, or state of being
The movie was bad.
badly = describes an action
The cut was stitched badly.
its = belonging to it
Its clean exterior mocked the chaotic mess inside.
it's = it is
It's going to be hot today.
lose = to have lost something
I do not want to lose the race.
loose = free, not fastened
The running clothes were loose and comfortable.
principal = the person in charge of a school; the main person, thing, or concept; the main amount of money
Mr. Jones the mean principal at school.
principle = a basic truth or standard
Not telling lies is a principle that he upholds.