The only way that they can preserve their history is to recount it as sagas--legends handed down from one generation of story-tellers to another.
（Lesson1）
step1 分析句子结构
The only way -主语
that they can preserve their history--定语从句
is to recount it as sagas-- 动词不定式作表语
--legends handed down from one generation of story-tellers to another. --sagas同位语
handed down from one generation of story-tellers to another.--过去分词作legends的后置定语
step2 词汇拓展
preserve 保护在一个好的状态
conserve 在数量上做保护
reserve 保留预留，在未来派上用场
preserve historical records 保护历史记录
preserve food/ one's eyesight 保护粮食、视力
conserve natural resourse/ widelife 保护自然资源、野生动物（数量）
reserve one's energy 保存实力
all rights reserved 各项权利得到保护 （专利）
I reserve the right to disagree. 我保留不同意见的权利。
reserve a table for 2 预定两人桌
例题：
The old building is in a good state of -----except for the wooden floors.(CET6)
A observation B preservation C conservation D reservation
答案：B （旧房子保持的一种良好状态）
动词不定式作表语时，若前面出现了实义动词“do”，则常去掉to
eg. All I have to do is dream.
The best thing you can do now is write her an apology.
The only thing to do was ask them to come half an hour later than the other guests.Then they arrived just when we wanted them.
All I wanted was to help him.
hand sth. down
pass sth. from older peopel to younger ones
eg. The recipe was handed down from the ancestor of the family.
这个秘方是被家族一个祖先传下来的。
story-teller 【tell stories 】讲故事的人
fortune-teller 【tell one's fortune】算命者
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