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used to do sth.<-->wait for
use up
1．用完；耗尽
They have used up their money．
他们已经把钱花光了。
Don't use up all the soap．Leave me some to wash with．
不要把肥皂用完，留些给我洗。
2．使精疲力尽
He has used up all his energy．
他已精疲力尽了。
After rowing the boat across the lake，Robert was used up．
罗伯特把船划到对岸之后，累得精疲力尽。
详解：run out of 后接物品名词，主语一般是人
run out 一般以物做主语，表示该物以用光,以主动形式表示被动意义
sb. use up sth.
be used up 意义与run out 相同，它本身就是被动形式，主语只能是物
例子：我们把钱用光了。
We ran out of money.
Our money ran out .
We used up our money .
Our money was used up .
used to do sth.<-->wait for
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