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LearningEnglishOnline---BySongLipersonalcomputer1971TV1927telephone1876car1885KeySentencesWhenwas/were主语invented?It/Theywas/wereinventedin时间.Forexample:Whenwasthelightbulbinvented?Itwasinventedin1878.Whenwerethecamerasinvented?Theywereinventedin1826.19271876---WhenwastheTVinvented?---Itwasinventedin1927.---Whenwerethetelephonesinvented?---Theywereinventedin1876.1971---Whenwasthecomputerinvented?---Itwasinventedin1971.1885---Whenwerethecarsinvented?---Theywereinventedin1885.Lookatthepicturebelow.Whatarethethingsonthetable?Whataretheyusedfor?Theshoeswithspecialheelsareusedforchangingthestyleofyourshoes.Theshoeswithlightsareusedforseeinginthedark.Thehotice-creamscoopisusedforservingreallycoldice-cream.GrammarFocusActiveVoice:AlexanderGrahamBellinventedthetelephonein1876.PassiveVoice:Thetelephonewasinvented(byAlexanderGrahamBell)in1876.Whenwasthetelephoneinvented?Itwasinventedin1876.Whatisthetelephoneusedfor?It’susedforkeepingintouchwitheachother.针对同学们所展示的最有用的发明，介绍发明者，何时发明的，有何用途等写一篇对话。可用下面的语言结构：What’sthemostusefulinvention?Whoinventedit?/Whowasitinventedby?Whenwasitinvented?Whatisitusedfor?