True: Mrs. Green is teaching her students now., Mr. Thomas will teach his students tomorrow., Mr. Thomas showed the world map yesterday., Mrs. Green showed the world map two days ago., Let's watch this film., Let me help you., False: Mr. Thomas taught his students tomorrow., Mr. Thomas has shown the world map yesterday., Mrs. Green will show the world map two days ago., Mrs. Green teaching her students now., Let watch this film., Let's me help you.,

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