同学你好，该知识点来自沪江网校《零基础直达BEC商务英语高级【四项全能实战签约 现金奖励班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好，for/ time is/ what life is made up of.
for在这里是一个连词，引导原因。time是主语，is是系动词，what life is made up of是一个表语从句。

补充：
连接表语从句的连接词有：that, what, who, when, where, which, why, whether, how, whoever，whichever ，whatever等。还有如because, as if, as though等。
This is what I want.
这就是我想要的
The reason why he was late is that his bike broke down.
他迟到是因为自行车坏了
Next sunday is when we shall meet.
下周日是我们见面的时间
This is why I am late.
这就是我迟到的原因
My problem is which computer to choose
我的问题是不知道选哪个电脑好
The argument is whether it rains tomorrow
明天是否下雨是争论的内容
What the police want to know is when you entered red the room
警察想知道的是你什么时候进的房间。
The trouble is that we are short of funds
困难是我们缺乏资金。
This is what we should do
这是我们应当做的。
That‘s why I want you to work there
那就是我要你在那儿工作的原因。
His first question was whether Mr. Smith had arrived yet
他的第一个问题是史密斯先生到了没有。
注意：从句中的疑问句用正常语序，即陈述语序。
as if,as though,because也可用来引导表语从句。
She seems as if she had done a great thing
她看起来好像做了一件大事。
It is because you eat too much
是因为你吃得太多了。

祝学业进步~