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來源：網絡資源 2023-07-12 17:53:21
現在完成時表示1)過去發生或已經完成的動作或存在的狀態對現在造成的影響或結果.(即它的"完成用法")e.g. I have just cleaned the classroom.
2)過去已經開始，一直持續到現在的動作或狀態。注意：此時動作可能還要繼續。(即它的"未完成用法")。E.g. He has lived in Beijing for ten years.
其結構是“have/has+過去分詞”。過去分詞的變化分規則與不規則兩種。規則變化與過去式相同，不規則變化需要另記。
它的否定句是在have/has后邊加not，變一般疑問句是把have/has提前。E.g. I have ridden a horse. I have not ridden a horse. Have you ridden a horse?
它的時間狀語通常為already, just, yet, ever, never, before等。另外還可和since+表過去的時間點，for+時間段連用。
做題時常見錯誤如下：
一、易丟掉have/has
例：He taken (take) the medicine before.
答案：has taken
解析：have/has 為助動詞，起構成時態的作用，是不能省略的。我們可以這樣記：“現在完成時態中，have/has 不可缺。”
二、have與has易用混
例：I has never heard (hear) of that before.
答案：have heard
三、延續性動詞與短暫性動詞易弄錯
例：She has left (離開) for 2 hours.
答案：has been away
解析：在肯定句中，與since或for引出的時間狀語連用的是延續性動詞，不能是短暫性動詞，但在否定句中短暫性動詞也是可以的。E.g. I haven't bought clothes for one year. 在此題中leave是短暫性動詞，不能與for+時間段連用，須把它改成相應的延續性動詞。如stop be over等。此題中leave要改成be away。這兩種詞的轉換是學習現在完成時需要注意的。
專項練習
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1、單選
1 You have _____ a tall young man.
A grown B grown into C grown us D grown up
2 He has ____ the watch for a year.
A buy B bought C have D had
3 Has your brother _____ the dog?
A kept in B fed C fed on D kept on
4I _____this book for two weeks, I have to return it now.
A borrowed B have borrowed C kept D have kept
5 Have you ever _____to the Great Wall? It's very beautiful.
A gone B been C went D go
6 Her brother _____the Party since 1978.
A joined B has joined C has been in D was in
7 The Greens _____many places of interest since they came to China.
A will visit B visited C have visited D visit
8 I'm sorry, I ____ your name.
A had forgotten B forgot C have forgotten D forgotten
9 The bookshop _____ for eight years.
A has been open B has been opened Chas opened D has open
10 We have all the paper so we need to buy some.
A used up B made of C filled with D hunted for
11 The flower I ____grown up.
A planted has B planted have C has planted D have planted
答案：1B 2 D 3 B 4D 5 B 6 C 7 C 8 C 9 A 10 A 11 A
2、填空
1 Have you ever ______(take) a train?
2 It _________(be ) more than three years since Jim ______(leave) here.
3 Have you _____(make)friends with your new classmates yet?
4 I _______(have) my lunch and I'm not hungry now.
5 Jim has never seen a panda, _____he?
6 We ______(be) good friends since we met at school.
7 We can't find him anywhere. Perhaps he______(go) home.
8 He _____(read) the book before.
9 Mr. Green _____(teach) us a lot about social studies since September.
10 I _____never____ (meet) her sister before.
答案：1 taken 2 has been, left 3made 4 have had 5 has 6 have been 7 has gone 8 has read 9 has taught 10 have met
四、have been to與 have gone to 易弄混
例：我去過北京。
I have gone to Beijing.
答案：I have been to Beijing.
解析："have been to+地點" 是表示曾去過某地，但此刻不在那兒(即在說話的地方)。而"have gone to+地點" 是表示去某地了，此刻在路上或已經到了那個地方(即不在說話的地方)。注意：這兩個句式后接副詞時，需省to。E.g. He has gone there.
五、 忘記把already變成yet
例：I have already finished my homework.(變一般疑問句)
Have you already finished your homework?
答案：Have you finished your homework yet?
解析：現在完成時態中，肯定句中有already，變否定句或疑問句時通常要改為yet.
六、在條件、時間狀語從句中用一般現在時表示將來
例：I'll go with you when I finish(finish) my homework.
答案：have finished
解析：在條件、時間狀語從句中表示將來完成的動作，用現在完成時。但注意，此時表示這動作將在另一動作之前完成，若兩動作同時發生，或幾乎同時發生，則一般不用現在完成時。
另外，現在完成時易與一般過去時弄混，前邊已經講過,這里不在重復。
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