如何使用時(shí)間狀語從句(3)
如何使用時(shí)間狀語從句
時(shí)態(tài)的呼應(yīng)和從句的位置
狀語從句的兩手絕活——時(shí)態(tài)的呼應(yīng)和從句的位置。請(qǐng)看：
第一點(diǎn)
時(shí)態(tài)呼應(yīng)一般來講，復(fù)合句都要遵循主、從句時(shí)態(tài)呼應(yīng)規(guī)律，狀語從句也不例外。即主句用現(xiàn)在時(shí)，從句也用現(xiàn)在時(shí);主句用過去時(shí)，從句也用過去的某種時(shí)態(tài)。如：
Be careful when you cross the road.過馬路時(shí)要小心。
You must see the doctor if you are ill.如果你生病了，你必須去看醫(yī)生。
主句是一般過去時(shí)，從句也要用一般過去時(shí)。如：
When he was seven years old, he could swim.當(dāng)他七歲時(shí)就會(huì)游泳。
She turned off the light before she left the office.她離開辦公室前就關(guān)了燈。
第二點(diǎn)
主從句的位置，大多數(shù)情況下，從句可以位于主句之前，也可以位于主句之后。不過從句在前時(shí)，主從句之間必須用逗號(hào)隔開。如：
Please tell me when he comes back. = When he comes back, please tell me.
這是一般現(xiàn)在，一般過去，現(xiàn)在進(jìn)行，過去進(jìn)行，現(xiàn)在完成，過去完成，現(xiàn)在完成進(jìn)行，一般將來，過去將來時(shí)的時(shí)間狀語:
1.Often,usually----------動(dòng)詞原型do,does,am,is, are
2.yesterday,last Sunday,in the past-------動(dòng)詞過去式did,was,were
3.now--------be+doing
4.while,at that time,-------was doing,were doing
5.since從句,for 2 days,------have done,have been
+過去的某個(gè)時(shí)間點(diǎn)----had done,had been
7.與現(xiàn)在完成相似-------have been+持續(xù)動(dòng)詞ing形式
8.一切表示將來的時(shí)間狀語，in+一段時(shí)間-------將來要發(fā)生的一般性動(dòng)作,
will,shall+原型
9.與一般將來時(shí)相似-----------would+原型
時(shí)間狀語
一般現(xiàn)在時(shí)every…, sometimes, at …, on Sunday,
一般過去時(shí)yesterday, last week, an hour ago, the other day, in 1982, just now
一般將來時(shí)next…, tomorrow, in+時(shí)間,
現(xiàn)在完成時(shí) for, since, so far, ever, never, just, yet, till/until, up to now, in past years, always, recently
過去完成時(shí)before, by, until, when, after, once, as soon as
過去進(jìn)行時(shí)this morning, the whole morning, all day, yesterday, from nine to ten last evening… when, while
將來進(jìn)行時(shí)soon, tomorrow, this evening, on Sunday, by this time, tomorrow, in two days, tomorrow evening
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