in case of / in case tense

IN CASE 像中文的 "萬一....", 後接 PRESENT TENSE
In case you do not understand, I'll expain......
Take the raincoat in case it rains.

IN CASE OF 意思和 IN CASE 一樣, 但OF 之後接的是名詞, 不用理會TENSE
It would be safer to take more money with you in case of emergency.