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1、 八上Unit9-Unit10必背知识清单 辨析 have been to, have gone to与have been inhave been to意为“去过某地”，强调往返的经历，现在已经回来。常与表示次数的副词连用，也可与ever/never/just.连用have gone to意为“到某地去了”，人不在说话的现场，可能在去的途中、在目的地或返回的途中have been in意为“待在某地”，表示状态，常接表示时间段的状语（since 2020/for six days/.).My uncle has been to New York three times.Hello, may I
2、 speak to Mike?Sorry, he isnt in. He has gone to the post office.encourage的用法（1)常用结构 encourage sb.to do sth.意为“鼓励某人做某事”（2)encourage=en + courage(勇气）My parents encourage me to learn dancing.Shewas notlacking incourage.辨析 invent, discover 与createinvent“发明；创造”通常指通过科学手段创造出原本不存在的东西The inventor invented 1
3、,093 inventions all his life.discover“发现；发觉”，指通过探险或偶然的机会发现原本不存在的东西Columbus discovered America in 1492.create“创造；创作”，往往指在艺术、文学等领域创造出新的具体的事物。Shakespeare created many famous characters. “for+时间段”的用法for three years是表示时间段的短语，通常和现在完成时搭配。“for十时间段”=“since+时间段ago”。I have worked in the factory for two years.=
4、I have worked in the factory since two years ago.【注意】当在表示现在完成时的结构中，谓语动词为非延续性动词时，不能与for和since引导的“一段时间”的短语连用，而必须用意思相同或相近的延续性动词来表示。buy-have(买）；borrow-keep(借）；come/arrive/reach/get to-be in(到达）；go out-be out(外出）；leave-be away(离开）；begin-be on(开始）；finish-be over(结束）；open-be open(开业）；close-be close(关闭）；die
5、-be dead(死亡）；join/take part in-be in(参加）；marry/get married-be married(结婚）Shed ratherdiethangive a speech.Hefelthalf dead with tiredness.Myleftarmhad gonedead.whether的用法（1)“是否”，常用来引导宾语从句，可与or not连用。（2)“不管(还是）”，引导状语从句，可与or not连用。Whether the students say it aloud or not, most of them expect there is no
6、 homework.Whether we will go there or not depends on the weather.【拓展】辨析 whether与if相同点不同点只能用 whether引导宾语从句，意为“是否”引导状语从句，if意为“如果”，whether意为“不管(还是）”1.与or not连用; 2.从句作介词宾语3.在动词不定式前; 4.在discuss等动词后Iaskedwhethertheycouldchangemyticket.Allshesworried aboutiswhetherheisallright.Illhelpyouifyoure stuck.Whati
7、fthisdoesnt work out?辨析among与betweenamong一般用于三个或三个以上的人或物之间The boy disappeared among the crowed.Inumberheramongmyclosestfriends.between一般表示在两者之间，常用结构为 between. and. (在和之间）Peter sits between Mary and Jane. consider的用法consider考虑 名词/代词/doing特殊疑问词to doconsider 认为(=regard) 宾语从句sb./sth.to be.sb./sth.as.Doctors considered changing another way to treat the illness.You should consider how to get there.I consider it to be useful to study online at home.Please consider what theyve done for you and what they mean to you. At first, some people considered me as a P.E. teacher.第 4 页 共 4 页学科网（北京）股份有限公司