1.in case ／just in case引导目的状语从句作“以免,以备,以防”等解.如：
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.
in case接条件从句,意为“如果、万一”.如：
In case we fail,we won't lose heart．万一我们失败,我们决不会失去信心.
Add more coal in case the weather is cold．如果天气冷,就添些煤吧.