此时是错综条件句的虚拟从句，要根据从句的时态，判断主句相对应的时态。过去某件事的发生与否，对现在造成的影响，所以要用现在完成时，所以是否需要用虚拟语气，根据实际情况判断，只有在若but for表示if it were not for或if it had not been for这样的意思（即表示“若不是”“要不是”），它一定要与虚拟语气连用：
But for my help, she would not have the exam. 若不是我的帮助，她就不会通过考试。
But for the would die. 如果没有大气，植物就会死亡。
But for your help, we 't have the work so soon.
如果没有你的鼎力相助,我们不可能这么快完成工作的。
I'd have been lost but for you.
要不是你，我就走迷路了。《汉英大词典》
But for you, they might have given us the slip.
要不是你，我们可能已经被他们甩掉了。《柯林斯高阶英汉双解学习词典》
But for your help, I might have .
假如没有你帮忙，我兴许会失败。
《汉英大词典》
But for your magic hand, I'd have long the .
要不是你妙手回春，我早就见阎王了。
《汉英大词典》
But for the -belt I ’t be alive today. 假若没有安全带, 我就活不到今天了。
I would have been in real but for your help. 要不是有你帮忙，那我可就倒大霉了。
But for the rain we would have had a nice . 要不是因为下雨, 我们的假日一定过得很惬意。
2. but for me但是对我而言, but for our ……但是（可是）对于我们的……而言
but for you 对于你而言；but for+时间，对于……时间来说
But for me is an .
但是对我而言，看电视是一种逃避的方法。
《柯林斯高阶英汉双解学习词典》
You may it , but for our it's an all- sign of good .
您也许会认为这样毫无用处，可是对于我们的客户而言，它却是优质服务的重要体现。
《柯林斯高阶英汉双解学习词典》
But for now, she is in the grip of a blind, anger
而现在，她陷入了一种无名的愤怒之中。
《柯林斯高阶英汉双解学习词典》
You’ll have your own soon but for the time being you’ll have to share one. 你很快就有自己的办公室了，不过暂时还得和别人合用一间。
have an role in the past, but for the , they're on the .
学生过去曾经发挥了重要的作用，不过现在他们变得无足轻重了。
He tried to speak, but for once, his voice had left him
他想说话，却一时语塞。
We don’t , but for you we’ll make an . 我们通常不接受支票，但对你我们可以破例。
3.but for+名词，也可以表示：也是为了……，而是为了……
I’m not for me, but for the baby. 我不是为我担心，而是为宝宝担心。
They go to the pubs not for the drink alone, but for the crack.
他们去酒馆不仅是为了喝酒，也是为了找乐子。
want to see done not just for , but for the good of
受害者希望正义得到伸张，这不仅是为了他们自己，也是为了社会的更广泛的利益。
The first was bad. But for some the took to it.
第一部系列剧糟透了，可是不知为何，观众开始喜欢上了它。
———END———
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