in case引导目的状语从句：
(1)He takes a torch in case it gets dark before he returns. 他带了手电筒，以备天黑以后回家之用。
(2)I decided to stay at home just in case my friends came round. 我决定留在家里，以防朋友们不期而至。
(3)I'll make some sandwiches in case you feel hungry on the journey. 我会做些三明治，免得你在旅途中饿着。
in case引导条件状语从句：
(1)In case we fail，we won't lose heart. 万一我们失败，我们决不会失去信心。
(2)Add more coal in case the weather is cold. 如果天气冷，就添些煤吧。
(3)In case you get home before I do，could you start preparing dinner? 如果你在我之前到家，你能不能动手做饭？