在表達(dá)一個(gè)在過去開始而現(xiàn)在仍在繼續(xù)或剛剛結(jié)束的動(dòng)作時(shí),某些動(dòng)詞既可以用現(xiàn)在完成時(shí),也可以用現(xiàn)在完成進(jìn)行時(shí)。這樣的動(dòng)詞有expect,hope,learn,lie,live,look,rain,sleep,sit,snow,stand,stay,study,teach,wait,want,work等.
How long have you learnt English?你學(xué)習(xí)英語多久了?
How long have you been learning English?(譯文同上。)
He has slept for ten hours.他已經(jīng)睡了十個(gè)小時(shí)了。
He has been sleeping for ten hours.(譯文同上。)
It has snowed for a long time.雪下了好長(zhǎng)時(shí)間了。
It has been snowing for a long time.(譯文同上。)

沒有進(jìn)行式的動(dòng)詞不可能有這樣的用法,即現(xiàn)在完成進(jìn)行時(shí)不能代替以下例句中的現(xiàn)在完成時(shí):
They’ve always had a big garden.他們一直有一座大花園。
How long have you known that?你知道這事多久了?
He’s been in hospital since his accident.他從發(fā)生事故之后,一直在醫(yī)院里。

注意:現(xiàn)在完成進(jìn)行時(shí)可以和時(shí)間短語連用,也可以不連用,這一點(diǎn)就有別于現(xiàn)在完成時(shí),因?yàn)楹笳吲c像for six days,since June,never等一些時(shí)間短語連用才能表示這類動(dòng)作。不用這些時(shí)間狀語時(shí),現(xiàn)在完成時(shí)指的是完成了的一個(gè)動(dòng)作。

B 用現(xiàn)在完成時(shí)表示的反復(fù)的動(dòng)作,有時(shí)可以作為連續(xù)的動(dòng)作用現(xiàn)在完成進(jìn)行時(shí)表示:
I’ve written six letters since breakfast.早飯后我已經(jīng)寫了六封信。
I’ve been writing letters since breakfast.早飯后我一直在寫信。
I have knocked five times.I don’t think anyone’s in.
我敲了五次門。我想屋里沒有人。
I’ve been knocking.I don’t think anybody’s in.

我一直在敲門。我想屋里沒有人。
注意:現(xiàn)在完成進(jìn)行時(shí)表示一種看來似乎是不間斷的動(dòng)作,所以提到做一件事的次數(shù)或一共做了多少事情時(shí),不能用現(xiàn)在完成進(jìn)行時(shí)。

C 用現(xiàn)在完成時(shí)表達(dá)的單一動(dòng)作和用現(xiàn)在完成進(jìn)行時(shí)表達(dá)的動(dòng)作是有區(qū)別的:
(a)I’ve polished the car.我擦了車。意指這件事已經(jīng)結(jié)束了。
(b) I’ve been polishing the car.我在擦車來著。

意指過去一小時(shí)我就是這樣度過的,而不一定指動(dòng)作已結(jié)束。注意:用現(xiàn)在完成進(jìn)行時(shí)表示單一動(dòng)作時(shí),這一動(dòng)作持續(xù)到說話的時(shí)間或者接近這一時(shí)間為止:
He’s been taking photos.
他一直在拍照。(他大概手里正拿著照相機(jī)。)
He has taken photos.
他拍過相片。(這件事可能是也可能不是最近發(fā)生的。)

例句:

1.He has been speaking English since he came to the USA.
(現(xiàn)在完成進(jìn)行時(shí),強(qiáng)調(diào)動(dòng)作的連續(xù)性。

2.Complete these sentences with the present continuous form of the verbs given in the brackets, changing the word order where necessary.
用括號(hào)中所給的動(dòng)詞的現(xiàn)在進(jìn)行時(shí)完成句子,必要時(shí)變化詞序。

t perfect ph.1. 【語】現(xiàn)在完成時(shí),2. 【語】現(xiàn)在完成時(shí)的

4.During the procession, the microprocessor finished the processing procedure.
在隊(duì)伍行進(jìn)時(shí),微處理器完成了加工過程.

execute and complete certain Works and remedy any defects therein as therein mentioned in conformity with the provisions of the said Contract.
去實(shí)施并完成某項(xiàng)工程,并在工程出現(xiàn)任何缺陷時(shí),按上述合同中有關(guān)條款規(guī)定進(jìn)行修補(bǔ)。

6.Installation of applications on this computer is complete. The computer will now restart.
已完成在此計(jì)算機(jī)上進(jìn)行的應(yīng)用程序安裝。計(jì)算機(jī)現(xiàn)在要重新啟動(dòng)。

7.During Iteration Planning, the Customer presents the features desired for the next two weeks.
在進(jìn)行迭代計(jì)劃時(shí),客戶演示下兩周內(nèi)希望完成的特性。

8.Change the following sentences into the Present Continuous Passive Voice.
把下列句子變成現(xiàn)在進(jìn)行時(shí)的被動(dòng)語態(tài)。

9.`I have finished' is an example of the present perfect.
“我已經(jīng)完成了”是現(xiàn)在完成時(shí)態(tài)的一個(gè)例句。

10.a perfective tense used to express action completed in the present.
一種用來表達(dá)現(xiàn)在已經(jīng)完成的動(dòng)作的完成時(shí)態(tài)。

11.And will learn The simple past tense, The present perfect tense, The past perfect tense as well as The future tense.
這個(gè)學(xué)期,我們學(xué)到了過去時(shí),現(xiàn)在完成時(shí),過去完成時(shí)和將來時(shí)等。

12.Cleanup of merge meta data cannot be performed while merge processes are running. Retry this operation after the merge processes have completed.
合并進(jìn)程運(yùn)行時(shí)無法執(zhí)行合并元數(shù)據(jù)的清除。請(qǐng)?jiān)诤喜⑦M(jìn)程完成后重試此操作。

13.Download Complete. Extracting Files.
下載完成。正在對(duì)文件進(jìn)行解壓縮。

14.The work is in hand and will soon be completed.
這工作在進(jìn)行中, 不久即可完成.

15.The work is in hand and will soon be finished .
工作在進(jìn)行中,很快就會(huì)完成。

16.The work be In hand and will soon be completed
這工作在進(jìn)行中, 不久即可完成

17.The request has been accepted for processing, but the processing has not been completed.
已接受請(qǐng)求,正在進(jìn)行處理,但尚未完成。

18.Queen Mary's joint degrees will be taught entirely in China.
女王瑪莉雙學(xué)位將完成在中國(guó)進(jìn)行。?