forfearof/that表示“由于害怕;惟恐,以免”of后接动名词,that后接从句用虚拟语气putonacoatforfearofcatchingacold.穿上外衣以免感冒。theweatherinlondonissochangablethatpeoplealwaysbringtheirumbrellawiththemforfearofrain.伦敦的天气很多变,人们总是要随身带着雨伞以防下雨。hetoldustokeepquietforfearthatwemightdisturbothers.他让我们保持安静,以免打扰别人。incaseof假使,万一incaseoffireringthebell.万一起火,请按铃。两者的区别:incaseofrain,theywon'tgo.假使下雨,他们就不去了。takeanumbrellawithyouforfearofrain.带上一把伞,以免下雨。incase指“假如某种情况出现,我们要……”,forfear指“我们要……以免某种情况出现”,前者强调主语的能动性,不过,两者的区别好像不是很明显。