The three words lightening, lightning and lighting are easily confused by English learners and even native speakers. Let's take a look at the differences. Lightening is the present participle of the verb to lighten describing the action of making something less heavy. A good example would be "I was lightening the load on my horse because it was exhausted." Lightning refers to a streak of static electricity through the sky usually accompanied by thunder, as here "I was struck by lightning while playing golf in a storm." Lighting is the arrangement of light especially in photography. A suitable example for this would be "The photo was dull because the lighting wasn't good enough".
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