2021秋八年级英语下册 Module 3 Journey to space Unit 3 Language in use课件（新版）外研版.ppt

Unit3学习目标：
复习现在完成时的用法
掌握already,just和yet的用法。ScientistshavesentspaceshiptoMars.Thejourneyhastakenseveralmonths.Astronautshavealreadybeentothemoon.NoonehasbeentoMarsyet,becauseMarsisveryfaraway,muchfartherthanthemoon.Scientistshavealsodiscoveredmanyothergalaxiesintheuniverse.ScientistshavesentspaceshiptotheplanetMarstotakephotos.Theyhaveevensentspaceshipstotraveloutsidethesolarsystem.NospaceshiphastravelledfarenoughtoreachotherstarsinourGalaxy.1.I’vejustmadeamodelspaceship.
2.Hasitarrivedyet?
3.Astronautshavealreadybeento
themoon.
4.Wehavenotfoundlifeonany
otherplanetsyet.GrammarSpaceshiponMars!
Astronautshave(1)________beentothemoonbuttheyhavenotbeentoanyotherplanets.However,aspaceship(2)_______arrivedonMarsandithas(3)_______sentbackphotosoftheredplanet.IstherelifeonMars?Wedonotknow(4)________.GrammarThespaceshiphasgonetoMars.
Ithasgonethere,butithasnotcomebackyet.
Astronautshavebeentothemoon.Theywentthereandthentheycameback.1.Astronautshavebeen/gonetothe
moonandreturned.
2.Thespaceshiphasbeen/goneinto
space.Itwilltravelfortendays.
3.Theastronauthasbeen/gonetothe
spacestation.Hewillcomeback
tomorrow.
4.Thespaceshiphasbeen/gonetothe
spacestation.Itbroughtbacktwo
astronauts.
3.Completethesentenceswiththeexpressionsinthebox.2.Lotsofastronauts___________to
thespacestation.Theyfoundit
veryinteresting.
3.Someastronauts____________to
themoontwice.
4.TwoBritishastronauts
__________tothespacestation.
TheywillcomebackinJanuary.GrammarAstronautshavealreadybeentothemoon.宇航员已经去过月球了。
Hehasjuststartedtoexploreotherplanets.我们才刚刚开始探索其他行星。
可以看出，just用来表示“刚刚”，already用来表示“已经”，两者都用于肯定句中，一般是置于have/has之后。在否定句中则可用yet,表示“还未”，有“以后可以会”的含义。例如：Thescientistshavenotheardfromityet.
科学家还没有收到它发出的信息。
Manhasnotdiscoveredanylifeinspaceyet.人类尚未在太空中发现生命。

另外，在使用现在完成时的时候，要注意与一般过去时的区别。现在完成时在表达经历时只表示该事件是在现在之前的某一个时间里发生的，重点在于已完成动作对现在的影响。而一般过去时则表示在过去某一具体时间发生的事情。例如：
IhavejustbeentoLondon.Iwenttherelastmonth.
我刚去过伦敦，上个月去的。
Ihavealreadyfinishedmyhomework.Ifinisheditanhourago.
我已经完成家庭作业了，一小时前完成的。在没有明确的过去时间状语时，如何判断该用