Learn to appreciate what you HAVE,before time makes you appreciate what you HAD.

问题描述:

Learn to appreciate what you HAVE,before time makes you appreciate what you HAD.
这句话的 主语是什么?what you have 是什么成分?是宾语从句?还是什么?what可以引导宾语从句吗?

这句话是祈使句,所以主语是 you,what you have 在此是what引导的宾语从句,充当appreciate 的宾语.