If I had noticed the warning signs , none of this would have happened.
如果我注意到了那些预警征兆，这种事就一桩也不会发生了。
Now those things have happened, there is no room for regret.
既然事情已经发生了，就没有后悔的余地了。
Some internet-driven changes have happened quickly, of course.
当然，一些互联网驱动的变化很快就发生了。
We mustn't forget the plants, without whose prior invasion of the land none of the other migrations could have happened.
我们不能把植物给忘了，没有它们事先入侵陆地，就不会有其他的迁徙发生。
What might have happened is neither here nor there.
曾经发生过什么事已经都不重要了。
None of this would have happened if you'd listened to me.
你要是听了我的话，这一切就不会发生了。
It's tempting to speculate about what might have happened.
大家不禁猜测，到底发生了什么事。
It must have happened at about five o'clock in the morning.
这件事一定发生在凌晨五点钟左右。
I hate to think what would have happened if you hadn't been there.
我不敢想你要是不在那里会出什么事。
What could have happened? A hold-up? There'd been no gunshot or scream.
发生了什么呢？持枪抢劫？没有听到枪声或尖叫声。
If we had been spotted at that point, I don't know what would have happened to us.
如果那时我们被发现了，我不知道我们会有什么后果。
Here, we'll take a look at a few of the most important events that have happened.
来，我们来看看发生的一些重要事件。
If the new safety system had been put to use, the accident would never have happened.
如果采用了新的安全系统，事故就不会发生了。
Anything could have happened in a ward.
在病房里什么事都有可能发生。
I do wonder what CAN have happened to me!
不知道我这样下去会变成什么样呢？
Heidi, knowing that something must have happened, followed him.
海蒂知道一定是发生了什么事，就跟着他。
All summer long they have hardly met, and very many wonderful things have happened.
整个夏天他们几乎没有见面，发生了许多奇妙的事情。
It would never have happened if he had stayed in Australia, for Australia is still the land of the bungalow.
如果他留在澳大利亚，这一切都不会发生，因为澳大利亚仍然是平房之地。
As Dr. Davies reports in the Public Library of Science, that is not what seems to have happened with at least one piscine antifreeze gene.
正如戴维斯博士在《公共科学图书馆》上发表的报告所述，至少有一种鱼的抗冻基因似乎并不是这样的。
They also argued that measures of productivity ignore what would have happened without investments in IT—productivity gains might have been even lower.
他们还认为，生产率的衡量忽略了如果没有对IT 进行投资会发生的情况：生产率的增长可能更低。
The notion is that people have failed to detect the massive changes which have happened in the ocean because they have been looking back only a relatively short time into the past.
这种观点认为，人们之所以没有察觉到海洋中发生的巨大变化，是因为他们用于回顾过去的时间相对较短。
Such things might possibly have happened ten years ago.
这类事情，10年前容许有之。
So, No, it shouldn't have happened!
所以，不，这本来是不应该发生的。
怎么能发生这种情况呢？
What's likely to have happened?
可能会发生什么？
Something bad must have happened.
肯定发生了什么不好的事。
Instead, two things have happened.
恰恰相反，发生了两件事。
Similar things have happened elsewhere.
其他地方也发生了类似的情况。
That does not seem to have happened.
这种现象似乎并未发生。
How could such a thing have happened?
为什么会发生这样的事情呢？
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