在句子中but的用法？详细！

but
conj.但是, 然而
The watch was cheap, but it goes quite well.
这块表虽然便宜, 但走得很好。
He is extremely strong—not but that he will catch cold at times.
虽然他特别健壮, 可是有时也会感冒。
而是
The purpose of the scheme is not to help the employers but to provide work for young people.
这个计划的目的不是为了帮助雇主, 而是为青年人提供工作机会。
Not that the machine is out of order, but that I have not learned to operate it.
不是机器出了故障, 而是我还没学会操作。
除了, 除去
They never meet but they discuss this problem.
他们每次见面都讨论这个问题。
相当于that(用于否定结构后)
There is no doubt but that he will win the election.
毫无疑问, 他将在竞选中获胜。
(用于加强语气)
It'll be the event of the year—everyone, but everyone, is coming.
这将是一年中的大事——每个人, 对, 就是每一个人, 都会来。
(用于表示惊奇或其他强烈感受)
But that's outrageous!
啊, 这太可恶了!
只因为, 可是只有
No one is so old but he may learn.[No one is so old that he may not learn.
]活到老, 学到老。
假如没有…, 要不是
I would fail my exams but that the classmates help me with my lesson.
要不是同学们帮助我学习功课, 我考试就会不及格。
prep.除…以外
We go to school every day but Sunday.
我们除了星期日每天都上学。
He has looked for it everywhere but in his own room.
除了他自己的房间外, 他到处都找遍了。
The problem is anything but easy.
这个问题绝不容易。
He does everything in the house but putting the children to bed.
除了安排孩子上床睡觉之外, 他在家里什么事都做。
Nobody but you could be so selfish.
除了你之外, 谁也不会这样自私。
She can do anything but sing.
她除了唱歌之外, 什么都会做。
We cannot but laugh.
我们不禁大笑起来。
It could do everything but stop.
除了停下来, 它什么事情都能做。
He wanted nothing but to stay here.
除了留在这里之外, 他别无所求。
But for the rain we should have had a pleasant journey.
要不是下雨, 我们会有一次愉快的旅行。
adv.只, 仅仅
He's but a boy.
他只不过是个孩子。

希望对你有用。