1、It +be +時間+ before/since/when從句,麓山濱江實驗學校 李瑛 2016-10-30,1. It is / has been + 一段時間 + since從句,如：It is 17 years since Hongkong returned to China. 香港回歸已經有17年了。,在“Its +時間段+ since從句” 句型中，如果since從句的謂語動詞是瞬間性動詞，表示肯定意義；如果since從句的謂語動詞是延續(xù)性動詞，則表示否定意義。,例如：,1) It is / has been ten years since he left Beijing.,譯文：自

2、從他離開北京已經十年了。,分析：since從句中的left是leave的過去式，是瞬間性動詞，表示肯定的意思，left譯為“離開”,2) It is / has been ten years since he was a doctor.他不當醫(yī)生已經十年了。,分析：since從句中的系表結構表示一種狀態(tài)，這種狀態(tài)是延續(xù)性的，表示否定意義，譯為“不是，不當”,注：時間的計算一律從since從句的動作完成或狀態(tài)結束時算起。,Itis/has beentwo days since she fell ill.,It is/has been two days since she was ill.,It

3、is two years since he studied English.（他已有兩年沒學英語了）,(她生病兩天了）,(她病好了兩天）,2. It was / will be + 一段時間 + before從句, 若主句是否定形式，翻譯成“沒過多久就” 例：,It was not long before the couple met again. 沒過多久這對夫妻就見面了。,1) 在 “It was + 一段時間 + before從句” 句型中,從句也是一般過去式：, 若主句是肯定句，翻譯成“過了多長時間之后才” 例：,It was long before they found their

4、son. 過了很久他們才找到他們的兒子。,2) 在 “It will be + 一段時間 + before從句”句型中,從句是一般現在時：, 若主句是肯定句，翻譯成“要過多長時間之后才”,例： It will be half a year before I come back. 半年后，我才回來。, 若主句是否定形式，翻譯成“用不了多久就”,例： It wont be long before we meet again. 我們不久就會見面。,3. it was+(時刻，或時間點）+ when sth. happened. 當某事發(fā)生時，是幾點鐘或哪一年 如：,It was 1997 when

5、Hongkong returned to China.,It wasfive oclock when we arrived at the small mountain village.,對比強調句型：It was at five oclock that we arrived at the small mountain village.,It+ is/ was+that多用于強調。,判斷方法如下：去掉it、be和that，余下的部分仍是一個完整的句子，這樣的句子一定是強調句。,強化習題：,1. It was two years _he realized the truth.,2. It will be two years _ the economic situation improves.,3. It was two years later _ he realized the truth.,4. It is /has been two years _ he lived here.,5. It was midnight _ he arrived home.,6. It was at midnight _ he arrived home.,7. It was not unti