lingtoneindicatesthatwhatissaidisastraight-forward,matter-of-factstatement,therisingtoneoftenmakesaquestionofwhatissaid,andthefall-risetoneoftenindicatesthatthereisanimpliedmessageinwhatissaid.18.Whatdoessentencestressmean?Sentencestressreferstotherelativeforcewhichisgiventothewordsinasentence.Somewordsaremoreimportantthanothers,andthemoreimportantwordsarepronouncedwithgreaterforceandmademoreprominent.ThemoreimportantwordsinEnglisharenouns,mainverbs,adjectives,adverbs,anddemonstrativepronouns,andtheothercategoriesofwords(articles,personalpronouns,auxiliaryverbs,prepositions,andconjunctions)areusuallynotstressed.Togivespecialemphasistoacertainnotion,awordinasentencethatisusuallyunstressedcanbestressed.Forexample:Heisdrivingmycar.Mymaybestressedtoemphasizethefactthatthecarismine.……(中间部分略)请——