in case 后跟什么时态?请举例见过两个例句:I've bought some sandwiches we get hungryi bought my key just in case you forgot yours重点是第二句...请解释为什么用forgot...字典例句里的..

问题描述:

in case 后跟什么时态?请举例
见过两个例句:
I've bought some sandwiches we get hungry
i bought my key just in case you forgot yours
重点是第二句...请解释为什么用forgot...字典例句里的..