语法书上讲 lest 从句中只能使用助动词 should + 动词原形和现在时虚拟式。是这样吗？
许多辞典和语法书只列举了 lest 从句使用助动词 should + 动词原形和现在时虚拟语气的例句。
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He ran away lest he should be seen. 他跑开了,以免被看见。
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Be careful lest you fall. 小心点儿,别跌倒。
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Earthen mounds were being hastily erected lest an attack should be launched that night. (CGEL) 人们急急忙忙地堆土堆，以防夜间敌人发动进攻。
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The animals must be destroyed lest the disease (should) spread. (CGEL) 必须把这些动物消灭掉,以防此病蔓延。
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I'll be kind to her lest she decide to leave me. (LDCE) 我将会对她很好,以免她决定离开我。
但是,实际上有时也可以见到 lest 从句使用陈述语气的例子:
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I had to grab the iron rail at my side lest I slipped. 我不得不抓住我这一侧的铁栏杆，以防滑下去。
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He wouldn't put the letter in his pocket lest he forgot about it. 他不把那封信放在衣袋里，为的是怕把那封信给忘了。
考生应当注意,各类英语考试的测试专家们只承认 lest he (should) do 的用法。
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I punish the child ____ he should make the same mistake. A. unless B. because C. as D. lest
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They criticized him ____ he should make the same mistake again. A. unless B. so that C. lest D. in case of