国产成人v爽在线免播放观看,日韩欧美色,久久99国产精品久久99软件,亚洲综合色网站,国产欧美日韩中文久久,色99在线,亚洲伦理一区二区

11.20 過去進行時
?
1) 概念:表示過去某時正在進行的狀態(tài)或動作。

2) 過去進行時的主要用法是描述一件事發(fā)生的背景;一個長動作發(fā)生的時候,另一個短動作發(fā)生。

3) 常用的時間狀語
this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while


   My brother fell while he was riding his bicycle and hurt himself. 
   It was raining when they left the station.
   When I got to the top of the mountain, the sun was shining. 

典型例題
1) Mary ___ a dress when she cut her finger. 
A. made  B. is making  C. was making  D. makes
  答案C. 割傷手指是已發(fā)生的事情,應(yīng)用過去時。同 時,when表時間的同時性, "瑪麗在做衣服時"提供事情發(fā)生的背景,因此用過去進行時。

2) As she ___ the newspaper, Granny ___ asleep.
read; was falling B. was reading; fell C. was reading; was falling D. read;fell
  答案B.句中的as = when, while,意為 "當……之時"。描述一件事發(fā)生的背景時,用過去進行;一個長動作發(fā)生的時候,另一個短動作發(fā)生。句意為 "在她看報紙時,奶奶睡著了。"句中的 fell (fall的過去時),是系動詞,后跟形容詞,如:fall sick。













 學(xué)習(xí)啦--英語語法大全