lest,for fear that和in case引起的從句用虛擬語氣(這時(shí)謂語多用should＋加動詞原形)
We dare not play jokes on Mr.Wang lest he should become angry.(我們不敢跟王先生開玩笑,恐怕他生氣.)
He hurried on,lest he should drop out in the forced match.(他加緊步伐,生怕在急行軍中掉隊(duì).)
Every attention must be paid to him lest he (should) feel that he is inferior to my other guests.(我對他特別關(guān)照,唯恐他感覺到比我的其他客人低人一等.)
虛擬語氣有若干種情形,有些不可以省略should,有些可以省略should（省略should多見于美語）.