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lest, for fear that引导的目的状语从句
基本结构：
lest(for fear that) + 主语 + should + 动词原形
隶属should型虚拟语气，其后动词用should + 动词原形，should可换为might, would, 也可以省略，意味“以免……, 为了……不……”。
1)She took a taxi to the station lest she should miss the train.
(= She took a taxi to the station so that(或in order that) she should not miss the train.
= She took a taxi to the station in case she should miss the train.)
2)He reminded her twice of it lest she should forget.
3)She always studies hard lest she lag behind.
4)Never let children play with fire lest they might set fire to the houses.
5)I quietly entered the room lest I should wake up my baby.
6)His mother punished him lest he should make the same mistake again.
7)He burned all the important documents lest they should fall into the enemy’s hands.
8)Weigh well your words lest they be swords.
9)We must not promise what we should not, lest we be called on to perform what we cannot.
注：以上例句1-9中lest都可被for fear that替换。
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