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This is a warmer, and there is nothing to download. It's just an idea for your lesson, not a worksheet.
The teacher should begin by explaining the terms”optimist” and “pessimist,”perhaps using the “glass-half-full-half-empty” analogy. Then in pairs, have students take opposite perspectives, one of an optimist or pessimist, on an issue that can be as easy as “Will it rain tomorrow?” to the more complex, “When will the economy improve?” Have them talk for about five to ten minutes then switch topics, and have students switch roles as well.
Besides providing vocabulary development and conversation practice, this exercise develops critical thinking skills as students discuss from a variety of perspectives.