來源:網(wǎng)絡(luò)來源 作者:中考網(wǎng)編輯 2020-11-10 15:50:21
中考網(wǎng)整理了關(guān)于2021年中考英語知識(shí)點(diǎn):其他時(shí)間狀語從句的用法 ,希望對(duì)同學(xué)們有所幫助,僅供參考。
1.由since引導(dǎo)的時(shí)間狀語從句。since引導(dǎo)的從句的謂語動(dòng)詞可以是延續(xù)性的動(dòng)詞,又可以是瞬時(shí)動(dòng)詞。一般情況下,從句謂語動(dòng)詞用一般過去時(shí),而主句的謂語動(dòng)詞用現(xiàn)在完成時(shí)。但在It is +時(shí)間+since從句的句型中,主句多用一般現(xiàn)在時(shí)。I have been in Beijing since you left. 自從你離開以來,我一直在北京了。Where have you been since I last saw you?自上次我和你見面以后,你到哪里去了?It is four years since my sister lived in Beijing. 我妹妹不在北京住有四年了。知識(shí)擴(kuò)展It is since從......以來多長時(shí)間了(因?yàn)閟ince +從句或名詞,表示一段時(shí)間)It is five years since we met last time.從我們上次見面已經(jīng)五年了。It is +before(......才)It was a long time before I went to sleep again. 過了很長時(shí)間我才睡著。It was an hour before(=until) the police arrived. 過了一個(gè)小時(shí),警察才來。
2.由as soon as, immediately, directly, instantly, the moment, the instant, the minute, 等引導(dǎo)的時(shí)間狀語從句,這些連詞都表示“一......就”。I will go there directly I have finished my breakfast.吃完早飯,我立即到那里去。The moment I heard the news, I hastened to the spot.我一聽到消息,馬上趕到了出事地點(diǎn)。As soon as I reach Canada, I will ring you up.我一到加拿大,就給你來電話。
3.由by the time引導(dǎo)的時(shí)間狀語從句。注意時(shí)態(tài)的變化:在一般情況下,如果從句的謂語動(dòng)詞用一般過去時(shí),主句的謂語動(dòng)詞用過去完成時(shí);如果主句的謂語動(dòng)詞用一般現(xiàn)在時(shí),主句的謂語動(dòng)詞用將來完成時(shí)。By the time you came back, I had finished this book.到你回來時(shí),我已經(jīng)寫完這本書了。By the time you come here tomorrow, I will have finished this work.你明天來這兒的時(shí)候,我將已經(jīng)完成此工作了。
時(shí)態(tài)問題
在狀語從句中,有“主將從現(xiàn)”的規(guī)定,即主句用一般將來時(shí),從句用一般現(xiàn)在時(shí)表示將來時(shí)。
注意:when 、while 、as 、after、 before、 as soon as、 since、 till /until 、by the time 在時(shí)間狀語從句中,要注意時(shí)態(tài)一致。一般情況下主句是將來時(shí)的時(shí)候,從句要用一般現(xiàn)在時(shí)。I will call you as soon as I arrive in Beijing. 我到北京就將給你打電話。(這是由as soon as引導(dǎo)的時(shí)間狀語從句,從句中的謂語動(dòng)詞arrive是一般現(xiàn)在時(shí),表示一般將來時(shí),決不可用will arrive)
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