5、現(xiàn)在完成時(shí)
現(xiàn)在完成時(shí)是由助動(dòng)詞have和has加過(guò)去分詞構(gòu)成的。主要表示此刻以前曾經(jīng)發(fā)生的動(dòng)作或情況。如:
Grain output has greatly increased in the past few years. 這幾年糧食產(chǎn)量有了很大增長(zhǎng)。
The area has suffered from disastrous(悲傷的) floods throughout its history.這個(gè)地區(qū)歷史上一直遭受水患之苦。
注意:過(guò)去時(shí)和現(xiàn)在完成時(shí)的區(qū)別:
現(xiàn)完成時(shí)的基本特點(diǎn)是它和現(xiàn)在有密切的聯(lián)系,或是指迄今為止這一段時(shí)間的情況,或是過(guò)去發(fā)生的事對(duì)現(xiàn)在造成的影響或結(jié)果等。而過(guò)去時(shí)主要強(qiáng)調(diào)過(guò)去某時(shí)刻所發(fā)生的動(dòng)作或情況,與現(xiàn)在沒(méi)有任何聯(lián)系。如:
Up till now we have planted over 10,000 apple trees. 到目前為止我們共種了一萬(wàn)多棵蘋果樹(shù)。
I saw him a minute ago. 我前一會(huì)還見(jiàn)到他的。
6、過(guò)去進(jìn)行時(shí)
過(guò)去進(jìn)行時(shí)是由助動(dòng)詞be的過(guò)去式加上現(xiàn)在分詞構(gòu)成的,主要表示過(guò)去某個(gè)時(shí)刻正在進(jìn)行的動(dòng)作。
At that time she was working as an assistant in a physics labatory.那時(shí)她在一家物理實(shí)驗(yàn)室做助手。
They took us to see the chemical fibre(纖維) mill that they were building. 他們帶我們?nèi)⒂^了他們正在修建的化纖廠。
7、過(guò)去完成時(shí)
過(guò)去完成時(shí)由助動(dòng)詞had加動(dòng)詞的過(guò)去分詞構(gòu)成,主要表示過(guò)去某時(shí)刻前業(yè)已完成的動(dòng)作或存在的狀態(tài),其實(shí)就是指過(guò)去的過(guò)去。使用時(shí)往往要要在從句中或有一個(gè)明確的過(guò)去時(shí)間狀語(yǔ)。
Before daybreak(黎明,拂曉) they had covered half the distance. 拂曉前他們已經(jīng)走完了大半路程。
No sooner had the rain stopped than they set out again. 雨一停他們就又上路了。
He had not learned any English before he came to the university. 上大學(xué)前他一點(diǎn)英語(yǔ)沒(méi)學(xué)過(guò)。
8、一般過(guò)去將來(lái)時(shí)
一般過(guò)去將來(lái)時(shí)由助動(dòng)詞would加動(dòng)詞原形構(gòu)成,主要表示從過(guò)去某一時(shí)間角度看以后將要發(fā)生的動(dòng)作。含這個(gè)時(shí)態(tài)的句子常帶一個(gè)表示“過(guò)去某個(gè)時(shí)間點(diǎn)”的狀語(yǔ)。這個(gè)狀語(yǔ)或是一個(gè)短語(yǔ),或是一個(gè)句子。這個(gè)時(shí)態(tài)常用于:賓語(yǔ)從句或間接引語(yǔ)中。例如:
When I thought about it, I wondered what their reaction(反應(yīng),反作用) would be. 當(dāng)我考慮這件事時(shí),我想知道他們的反應(yīng)是什么。
She told me that she would go on trip to Europe the next day. 她告訴我,她第二天要去歐洲旅行。
Whenever he had time, he would help his mother with some housework. 無(wú)論他什么時(shí)間有空,他總是幫他媽媽干點(diǎn)家務(wù)活。
No matter how difficult the work was , he would keep on doing it until he accomplished it . 不管工作有多難,他總會(huì)堅(jiān)持不懈地把它干完。
9、一般將來(lái)完成時(shí)
一般將來(lái)完成時(shí)由shall (will) + have + 過(guò)去分詞構(gòu)成。主要表示在將來(lái)某時(shí)業(yè)已發(fā)生的動(dòng)作。如:
After we finish this text, we‘ll have learned twenty texts. 這課課文結(jié)束后,我們就學(xué)了二十課課文了。
By the next month, I‘ll have finished my task. 到下個(gè)月,我將完成任務(wù)。
They will have hit the year’s target by the end of October. 到十月底他們就可完成全年的指標(biāo)了。
10、現(xiàn)在完成進(jìn)行時(shí)
現(xiàn)在完成進(jìn)行時(shí)由have(has)been加動(dòng)詞的現(xiàn)在分詞構(gòu)成,表示發(fā)生在過(guò)去的某個(gè)動(dòng)作延續(xù)到現(xiàn)在或剛剛完成,或許還要繼續(xù)延續(xù)。這種時(shí)態(tài)側(cè)重于這個(gè)動(dòng)作的連續(xù)性,或者說(shuō)不間斷性。例如:
I’ve been waiting for you for the whole morning. 整個(gè)上午我一直在等你。
It has been raining for three days. 雨連續(xù)下了三天。
Where have you been? 你去哪兒啦?
She has been busy preparing the exhibition since we met last time.自我們上次見(jiàn)面以來(lái),她就一直忙著籌備那個(gè)展覽。
11、過(guò)去完成進(jìn)行時(shí)
過(guò)去完成進(jìn)行時(shí)由had been加現(xiàn)在分詞構(gòu)成,表示過(guò)去某一時(shí)刻之前開(kāi)始的動(dòng)作或狀態(tài)一直延續(xù)到過(guò)去某一時(shí)刻。例如:
It had been raining cats and dogs for over a week and the downpour(傾盆大雨) had caused landslides(山崩) in many places. 傾盆大雨下了一周,在許多地區(qū)引發(fā)了山崩。
At last they got the telegram they had been expecting. 最后他們收到了他們一直盼望的電報(bào)。
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