Think about what you are trying to communicate before you write or say anything.
Use only one negative word in your sentence. Negative words include "no," "not," "none," "nothing," "nowhere," "neither," "nobody," "no one," "hardly," "barely" and "scarcely."
Remove any second references of a negative word and use a positive word in its place. For example, instead of saying "I hardly have none," say "I have some."
Proofread your paper and look for any sentences containing a double negative.