4.When I first arrived in San Francisco, I had a difficult time understanding certain aspects of the American way of doing things.

刚到旧金山的时候，有段时间我感到很难理解某些美国人的处事方式。 have a difficult time (in) doing sth."有一段较为困难的时光"。 (2013·江西高考书面表达)爬山有点困难，但到达山顶后，我们高兴地又跳又叫。

We have_a_difficult_time_(in)_climbing_the_hill,_but we jumped and cheered with joy after we got to the top. 5.I had a similar experience the last time I visited China.

上次我到中国参观时也有同样的经历。 the last time"上次......的时候"，用作连词引导时间状语从句。 (2016·全国卷Ⅱ书面表达)我仍然记着上次你来我们学校参观的时候给我展示了关于那个主题的照片。

I remember you showed me some photos on that theme the_last_time_you_visited_our_school. 　　

　　二、课堂重点深化

　　1．owe vt.欠(情、债等)；归功于

　　　[自主体验]

　　单句语法填空

　　①These early settlers owed their survival_to hard work and determination to succeed.

　　②I owe it to you that I finished my work ahead of time.

　　③Owing to the bad weather, the flight was delayed for a couple of hours.

　　句型转换

　　④The country owes foreign countries billions of dollars because of the financial crisis.

　　→The country owes billions of dollars to foreign countries because of the financial crisis.

　　　[系统归纳]

　　owe sb.sth.＝owe sth.to sb.　　 欠某人某物

　　owe ... to ... 把......归功于；归因于

　　owing to 因为；由于

　　owe it to sb. that ... 多亏了某人

　　　[重点强化]

易错处处防