Unit 8 Have you read Treasure Island yet?语法-现在完成时

课件32张PPT。The present perfect tense现在完成时1.过去某一时间点发生的动作对现在产生影响。功能：2.过去某一时间点发生的动作持续 到现在或还将持续下去。The present perfect tense助动词 （可以帮助构成肯定、疑问和否定句）1.He has cleaned his room.
(写一个一般疑问句）Has he cleaned his room?2. She has lived in London
for four years. (划线部分提问）How long has she lived in London?3. He has been to China, ____ ____?
（写出反义疑问句部分）hasn’t he 4. They have come back from work.
(写否定句）They haven’t come back from work. What are the key words for the Present Perfect Tense?A: ______ your brother ______ his homework yet? (finish)
B: Yes, he ‘s already done it.Key wordsHas finished yet already 注意：already 用于肯定句，
yet 用于疑问句和否定句中
A: _______ you ever _______ to the park? ( be )
B: No, never. Key wordsHave been yet already ever never 注意： ever 曾经 用于疑问句中
never 从不 带有否定意义I ______ just ________ the desk, you can take it to your classroom . (mend )Key wordshave mended yet ever never just already Just 刚刚 与现在完成时连用 一般置句中
Just now 刚才 与一般过去时连用Tom ___________ in the factory since he left school ten years ago. (work )Key wordshas worked yet ever never since already since 后面带过去时间或有一般过去时的句子A: How long ______ you ________ in this school? (teach )
B: For 6 years. Key wordshave taught yet ever never since for already + 一段时间We _______ only ____________ 100 trees so far. (answer ) Key words have planted yet ever never since for just already so far 到目前为止Key words yet ever never since for just before already so far in the past 10 years twice 也可以是其他表示次数的词how longSome verbs can't often be used with "for" or "since"Please point out any mistakes and correctShe has bought the computer for two years.hadPlease point out any mistakes and correctHow long have you come to the United States？ been in Please point out any mistakes and correctAnn has gone to China since three months ago.been inPlease point out any mistakes and correctMy brother has joined the army for five years. been inbeen a soldier Please point out any mistakes and correctI have left Shanghai for 3 days. been away for 3 days. Please point out any mistakes and correctI have borrowed the dictionary since 3 days ago . kept Please point out any mistakes and correctThe film has begun for 10 minutes. been on Please point out any mistakes and correctThe concert has finished for half an hour. been over Please point out any mistakes and correctHis dog has died for two years . been dead can you distinguish?去过某地已经回来
常与ever, never,
once,twice,连用 一直留在某地
与for / since连用
用how long 提问去了某地
还没回来不与
只用于第三人称
Her sister _____________ Australia,
She left this morning.has gone to can you distinguish?去过
常与ever, never,
once,twice,连用 在…
与时间段连用
用how long 提问去了
说话时某人不在
只用于第三人称 A: Where is Bob ?
B: He ____________ Japan with
his sister. has gone to can you distinguish?去过
常与ever, never,
once,twice,连用 在…
与时间段连用
用how long 提问去了
说话时某人不在
只用于第三人称 A: How long ____ you _______ China?
B: I _________ here for 3 years. have been have been in can you distinguish?去过
常与ever, never,
once,twice,连用 在…
与时间段连用
用how long 提问去了
说话时某人不在
只用于第三人称 A: _____ you ever ________ the city ?
B: No , never .Have been to The past tense or the present perfect tense know have known knew The past tense or the present perfect tense saw have lost The past tense or the present perfect tense have did move lived The past tense or the present perfect tense did has finished see saw