关于lest,for fear that,in case的虚拟语气用法他们的谓语动词是不是 必须要用should+动词原形 貌似这三个中有哪个是可以省略should的 是哪个?咋就3个答案都不一样= =

lest: 惟恐 = in case假使，免得
I was afraid to open the door lest he should follow me...
And, lest we forget, Einstein wrote his most influential papers while working as a clerk.
for fear of, for fear that 以免，生怕
She was afraid to say anything to them for fear of hurting their feelings...
She was afraid to say anything to them for fear that they will get hurt.
I had to run away for fear that he might one day kill me.
in case 假使，免得
In case anyone was following me, I made an elaborate detour...
Many shops along the route have been boarded up in case of trouble.
She's nervous about something, in case you didn't notice...

1.在for fear that, in case, lest引导的从句中，若用虚拟语气时，从句谓语为：should + 动词原形。并且 should不能省略 She examined the door again for fear that a thief should come in. 她又把门检查了一遍，以防盗贼的进入。 He started out earlier lest he should be late. 他很早就出发了以防迟到。 2、在so that, in order that所引导的目的状语从句中，从句中的谓语为：can / may / could / might / will / would / should + 动词原形。 He goes closer to the speaker so that he can hear him clearer. 他走近说话的人以便能听得更清楚。 He read the letter carefully in order that he should not miss a word. 他把信读得很仔细以便不漏掉一个单词。
其他用法

in case 一定不能省should
另两个可省
貌似不同语法书说法不同
保险点你就别省了呗

lest、for fear that和in case引导的从句用虚拟语气，其谓语部分用“should+动词原形”。
其中，lest和for fear that引导的葱郁，可以省去should，但是in case引导的从句，如果表示虚拟，should一般不可省略！

凡是由lest（以免；免得）,in case（以防）和 for fear that（生怕,唯恐）引导的目的状语从句中,用“should+动词原形 其谓语部分should可以省略.例如：Keep quiet in case you（should）interrupt himwhen he is bus...