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1、人教版八年级英语下人教版八年级英语下Unit 8 语法课件语法课件语法加油站现在完成时现在完成时 现在完成时 1.含义2.基本结构表示过去发生或已经完成的动作对现在造成的影响或结果。have/has+过去分词含义3.标志词already yet never ever just before 等等肯定句主语+have/has+过去分词+其他例：I have had my lunch.我已经吃了午饭了。主语+have/has+not+过去分词+其他否定句一般疑问句Have/Has+主语+过去分词+其他？例：Have you had your lunch?你吃过午饭了吗？4.结构例：I have n
2、ot(havent)had my lunch.我还没吃午饭。语法加油站现在完成时现在完成时 现在完成时 5.动词 动词过去分词的变化规则：动词过去分词的变化规则：1）动词一般在词尾加“-ed”如：workworkedworked2）以“e”结尾的动词，词尾加“-d”如：livelivedlived3）以“辅音字母+y”结尾的动词，将“y”变为“i”，再加“-ed”如：crycriedcried4）以重读闭音节结尾，末尾只有一个辅音字母，先双写 该辅音字母，再加“-ed”如：stopstoppedstopped5）不规则动词的变化形式没有规律，如：see-saw-seen eat-ate-eat
3、en break-broke-broken go-went-gone take-took-taken send-sent-sent find-found-found make-made-made have-had-had6.用法1.表示过去某个时间发生的动作对现在造成的影响或结果2.表示从过去某一时刻开始一直持续到现在的动作或状态。这个动作可能刚停止,也可能仍然在进行。常带有for和since等表示一段时间的状语。例如：He has taught here since 1981.他自1981年就在这儿教书。(可能还要继续教)I havent seen her for four years.我有
4、四年没见到她了。现在完成时6.用法3.already:通常放于肯定句中意为“已经”有时放于疑问句中表示怀疑惊讶等的语气。如:I have already finished reading the book.我已经读完这本书了。Have you finished reading he book already?你已经读完这本书了么？yet 一般用于疑否句中，在句中意为“已经”；在否定句中意为“还”通常放于句末。如：Have you found the book yet?你已经找到那本书了么？Not yet.还没找到。She hasnt finished her homework yet.她还没完
5、成作业。4.在现在完成时的句子中非延续性动词不能直接与for 或since 连用，要变成表状态的形式。如：buy-have borrow-keep go out-be out leave-be away begin-be on open-be open close-be close die-be dead come-be join-be in 注：非延续性动词在否定句中可以用现在完成时。如：I havent bought anything for two months.如：They came here in 2008.-They have been here since 2008.Tom bo
6、ught the car in 2009 -Tom have had the car since 2009.语法加油站一、句型转换。1.Ive already had dinner.（改为一般疑问句）_ you _ dinner _？2.He has just finished his homework.（改为否定句）He _ _ his homework _.3.Mums cooked the dinner.（改为否定句）Mum _ _ the dinner.Have had yethasnt finished yethasnt cooked4.She joined the music cl
7、ub last week.(改为现在完成时)She _ _ _the music club _two weeks.适当形式填空 5.He _(leave)the country and gone to India.6.I have _(be)here for two months.7.Im waiting for my son.He _ _(not come)back from school.hasbeeninforhas leftbeenhasnt come语法加油站二、单项选择()1._ you ever _ with a group?Yes,I have.A.Did；study B.Ar
8、e；studying C.Were；studying D.Have；studied()2.How many times _ you _ to Beijing this year?A.have;been B.did;been C.have;gone D.did;goneDA语法加油站()3.Have you taken out the trash,Belly?_.Ill do it right away.A.Sorry,I have B.No,I didnt C.No,I dont D.Not yet()4.Have you _ visited Shanghai?No,_.A.ever;not B.never;not C.ever;never D.never;everDCThats all。Thank you!请记住 爱讲语法的英语耿老师