before的語法用法? 一、It be some time before… 此句型關鍵有四種含義,分别闡述如下:,接下來我們就來聊聊關于before的語法用法?以下内容大家不妨參考一二希望能幫到您!
before的語法用法
一、It be some time before…
此句型關鍵有四種含義,分别闡述如下:
1.該句中主句為将來時态,before從句為一般現在時态;主句為一般過去時,從句通常也為過去的時态。
2.例如:
It will be some months before we graduate from school.(過幾個月,我們就畢業了。)
Shall we see him again? (我們還能見到他嗎?)
I think so. It won’t be long before he comes back to the hometown.(我想會的,過不了多久他又返回家鄉。)
該句型中的時間長為long, a long time, years, months, weeks, days, hours, minutes等時間段。此句型容易與強調句型混淆,試比較:
It was two years before he came back from abroad.(過了兩年他才從國外回來。)
It was two years later before he came back from abroad.(兩年之後他才從國外回來。)
第一句為狀語從句,it 表示時間;第二句為強調句型,強調的是時間狀語two years later。
3.該句型的引申為“還沒來得及……就……”。請看例句
Someone called me up in the middle of the night, but they hung up before I could answer the phone.(半夜裡有人打電話,但是我還沒來得及回答他就挂了。)
4.該句型還有一個引申含義為“……之後才……”,多與持續性時間、動作連用。例如:
Several weeks had gone by before I realized the painting was missing.(幾周之後,我才意識到那幅畫丢了。
二、“not…before”句型有時可換成“hardly…when…”或“scarcely…when”句型
例如:
They had not talked for half an hour before she entered. =They had hardly/scarcely talked for half an hour when she entered.
三、“not…before”句型同“not…until”句型意思相同,表示“直到……才,在……以前不……”(即在否定句中,until 和 till 可以和非延續性動詞連用,這時 until 和 before 近義)
比較例句:
She stood there till/until he had passed out of sight.(不用before)他一直站在那兒,直到他消失。
The moon will not come out until/before the clouds disappear.雲散了月亮才會出來。
One doesn’t know the value of health before/until he loses it.人們失去了健康後才知道健康的珍貴。
四、Before, after與behind
before表時間、順序或排列時與after相對;表位置時與behind相對。例如:
I saw the headmaster the day before yesterday.我前天見到了校長(時間)。
Autumn comes before winter.秋去冬來(順序)。
A comes before B in the alphabet.在字母表裡A排在B之前(排列)。
五、before long與long before
before long是“很快,不久(以後)”的意思,等于soon,可以用于各種時态,例如:
Before long he got married.不久他就結婚了。
而long before是“很久以前”的意思,等于long long ago,一般用在過去時或過去完成時的句子裡。例如:
I saw the film long before.我很久以前就看過這部電影。
另外,before在不同的語境中會産生不同的含義,學生、教師在學習、教學中要認真研究,加以甄别。例如:
Linda has grown into a beautiful girl before she knows it.不知不覺Linda已長成一個亭亭玉立的少女。
Do it before you forget.趁早動手,免得忘記。
Be a pupil before you become a teacher.先做學生再做老師。
Lucy desired no one for her husband before Charles Darnay.
Lucy非Charles Darnay不嫁。
I’ll shoot myself before I apologize to him.我甯死也不向他道歉。
The ship sailed before the wind.輪船順風而行。