以免,惟恐,后面用虛擬語氣,
He worked hard for fear that he might be fired by the boss.
他拼命地干活惟恐被老板解雇.
He walked fast for fear that he should be late.
他快走,以免遲到.
for fear of/that 表示“由于害怕；惟恐,以免”of后接動名詞,that后接從句用虛擬語氣
Put on a coat for fear of catching a cold. 穿上外衣以免感冒.
The weather in London is so changable that people always bring their umbrella with them for fear of rain. 倫敦的天氣很多變,人們總是要隨身帶著雨傘以防下雨.
He told us to keep quiet for fear that we might disturb others.
他讓我們保持安靜,以免打擾別人.
in case of 假使,萬一
In case of fire ring the bell.萬一起火,請按鈴.
兩者的區(qū)別：
In case of rain ,they won't go .假使下雨,他們就不去了.
Take an umbrella with you for fear of rain .帶上一把傘,以免下雨.
in case 指“假如某種情況出現(xiàn),我們要……”,for fear指“我們要……以免某種情況出現(xiàn)”,前者強調主語的能動性,