The Incredible Lightness of Being

John McWhorter considers the eccentric irregularity of the verb to be. Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at www.slate.com/podcastsplus. Twitter: @lexiconvalley Facebook: facebook.com/LexiconValley Email: lexiconvalley@slate.com  Learn more about your ad choices. Visit megaphone.fm/adchoices