Yet this is not always the case.

　　A famous actor in a highly successful play was once cast in the role of an aristocrat who had been imprisoned in the Bastille for twenty years. In the last act, a gaoler would always come on to the stage with a letter which he would hand to the prisoner.

　　4. Yet this is not always the case.

　　但情况却并不总是这样。

　　语言点:句子结构分析:yet表转折，这是一种相当委婉的表达方式。

　　5. A famous actor in a highly successful play was once cast in the role of an aristocrat who had been imprisoned in the Bastille for twenty years.

　　有一位名演员曾在一出极为成功的剧目中扮演一个贵族角色，这个贵族已在巴士底狱被关押了20年。

　　语言点1:句子结构分析:who引导定语从句，修饰arisocrat。

　　语言点2:优秀写作短语总结:扮演一个…角色;起到…作用

　　cast a role of

　　have a role in

　　play the part of

　　be in the role of

　　例句支持:

　　The regimental police have played a great role in this rescue.

　　特警在这次解救行动中起到了极其重要的作用。

　　6. In the last act, a gaoler would always come on to the stage with a letter which he would hand to the prisoner.

　　在最后一幕中，狱卒手持一封信上场，然后将信交给狱中那位贵族。

　　语言点1:句子结构分析:which引导定语从句，修饰letter。

　　语言点2:had sth.to sb.的意思是“把某物交给某人”。