in case of 和 in case分别放在句子的什么位置 句首、句中还是句末

in case of 句首，句中 In case of a fire, call 119. Call 119 in case of a fire. in case 句首，句中，句末 In case it rains, take an umbrella. Take an umbrella in case it rains. I think it should rain, so you'd better take an umbrella in case. 仅供参考。