I take an umbrella just in case (that) it rains later.
in case 后接一般现在时、扮培一般过去时陪州或 should,语法有点类似if,但是意思却不同,不可混淆,大部分时候省略后面从句
You'd better take an umbrella,just in case.
你最好带上雨伞,以防万芦缺蔽一。
You should bring some more money just in case extra changing.
Just in case (I go to school late), I get up early.
He gripped his pistol tightly, just in case.
他握紧手抢, 以防数埋粗万一。
I'll run you a copy just in case.
我给你搞一个副本吧,以防万一。
It may rain; You'd better take an umbrella just in case.
可能液漏下雨, 拿把伞薯镇吧, 以防万一。