TheStudyofLivingThingLesson28:I.Learningaims:Masterthenewwords:biology,butterfly,migrate,fantastic,completely,grandchild,female,milkweed,chemical,puzzlingII.Learningimportantanddifficultpoints:both…and…biologybutterflymigratefantasticcompletelygrandchildfemalemilkweedchemicalpuzzlingNewWordsNewWordsWhatdoyoudo?1.Puteightspoonfulsofcornstarchintothebowl.2.Addfourtofivespoonfulsofwater.3.Mixthecornstarchandwatertogether.4.Pourthemudintoyourhand.5.Openandcloseyourhand.mixWhatishappening?Somethingsdissolveinwater.Sugardissolvesinwater.Saltdissolvesinwater.Butnotcornstarch.Itonlymixeswithwater.Whenyoucloseyourhandandpress,someofthewatergetsout.Themudbecomessolid.Whenyouopenyourhand,thewatermixesinagain.Nowitisaliquid!Whatelsecanyoudo?Putsomeofthemudinabowl.Nowhitthemudwithyouropenhand.Whathappens?Nowdothesamethingwithwater.Arethemudandwaterthesamewhenyouhitthem?LanguageLanguagePointsPoints作形容词，意为“奇异的、极好的、了不起的”，在句中作定语或表语。如：1.fantasticIthinkthisisafantasticinvention.我想这是一个了不起的发明。作可数名词，意为“化学物质、化学制品”，复数形式是chemicals。如：Therearenochemicalsinthiskindoffood.这种食品中没有化学物质。2.chemical作形容词，意为“化学的、化学作用的”，在句中作表语或定语。如：Wecanfindchemicaladditivesinmanyfoods.我们在很多食品中发现了化学添加剂。句中的havebeendrawing是现在完成进行时，它由“助动词have(has)+been+现在分词”构成，当主语是第三人称单数时用助动词has，其他情况用助动词have。现在完成进行时主要表示从过去开始一直持续到现在的动作，这个动作是否延续下去，要根据上下文而定。3.FantasticfactsaboutthebutterflyhavebeendrawingDr.Taylor’sattention.它往往与表示一段时间的时间状语连用，如：allthetime,thismonth,allday,thesefewdays,forayear,sinceaweekago等。Shehasbeenplayingbasketballafterschoolthisweek.这个星期她放学后一直打篮球。Tonyhasbeendrawinginhisbedroomalltheafternoon.托尼在卧室画了一下午。连词both…and…的意思是“……和……都，既……也……”，它可以连接句中句子成分相同的词语，如果用它连接主语时，谓语动词要用复数形式。BothLiPi...
