1.时态：一般过去时
主干：末班车没来，我们走回家
关键词： 半个小时过去了(half an hour went by)
译：Half an hour went by, but the last bus not come, we had to walk home.
2.时态：她看上去担心考试——一般现在 时，还没有背熟课文——现在完成时
主干：她担心考试，因为她没背熟课文。
关键词：learn ...by heart
译：Mary looks worried about the Chinese exam because she has not learned the text by heart.
3.时态：过去完成时 (since )
主干：篮球比赛已经被推迟，我们不妨去参观博物馆
关键词：postpone 推迟might as well不妨
译：Since the basketball was postponed, we might as well visit the museum.
4.时态：一般过去时
主干：他和父母住在澳大利亚
关键词：all the well一直during 在什么期间
译：He lived with his parents in Australia all the well during the second world war.
5.时态：现在完成时
主干：我与我的大学同学失去了联系
关键词：kind of lost touch
译：Since I graduated from Nanjing university in 1985,I have kind of lost touch with my university students.
