in case用作连词时有以下两个用法： 1. 表示条件，意为“如果”“万一”。如： In case it rains, do not expect me. 如果下雨，就不要等我了。http://yingyu.chazidian.com In case you see him, ask him about it. 如果你见着他，问问他这事。 In case I forget, please remind me of my promise. 如果我忘了，请提醒我我的诺言。 In case he arrives before I get back, please ask him to wait. 如果他在我回来之前到，请让他等等我。 2. 表示目的，意为“以防”“生怕”。如： I’m shy of buying shares in case I lose money. 我不敢买股票，怕赔钱。 Take warm clothes in case the weather is cold. 带些暖和的衣服，以防天气变冷。 I’ll keep a seat for you in case you should change your mind. 我给你留一个座位，以防你会改变主意。 We took our swimming things in case we happened to find a pool. 我们带上游泳用品，以备万一能找到一个水池。 注：有时中间的谓语由 should构成，强调偶然性，可译为“万一”： I wrote down her address in case I should forget it. 我写下了她的地址，以防万一我忘了。 I always slept by the phone in case he should ring during the night. 我总是睡在电话机旁边，怕万一他夜间打电话来。