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"Truth-tellers, Pennebaker explains, tend to use more words, bigger words, more complex sentences, more exclusive words (except, but, without, as in the sentence "I think this but not that"), and more I-words (I, me, my, etc.). Liars, apparently, trade in simple, straightforward statements lacking in specificity because—Pennebaker posits—it's actually pretty difficult to make stuff up. " Read more on The Secret Life of Pronouns.