之前我們討論了：
下面討論Third Conditional
When we are talking about something in the past which cannot be altered now, we use:
當我們討論某種過去發生過的也不可能更改的事實時，我們使用：
If + Past Perfect過去完成時, would have + past participle過去分詞
比如:
If you had studied all of these grammar pages, you would have passed the exam.
如果你學習了所有的這些語法，你本來考試可以及格。
You can not alter or change the past. You didn't study in the past (something you cannot change now) so you didn't pass the exam. It is an imaginary situation that didn't happen.
你不能改變過去。你過去沒有學習（這是現在無法改變的），所以你考試沒及格。這是一種想象的，沒有真實發生的情況。
If you had been more careful, you wouldn't have had an accident.
If I had seen you, I would have said hello.
If he had asked me, I would have helped him.
If you had studied, they would have passed the exam.
If I had known, I wouldn't have done that.
Notice how this tense can be used to say that you regret doing something or when you are telling someone off (reproaching someone). This type of conditional can also be used when making excuses.
注意這種時態怎樣表達你後悔沒有做某些事，或當你斥責某人時。這種類型的conditional也可以發生在找藉口時。
We can also change the word order of the sentence...
我們也可以改變單詞順序：
Would have + If + past perfect過去分詞
例子:
You would have passed the exam if you had studied all of these grammar pages.
你本可以及格的，如果你把所有語法都學完的話。
I wouldn't have left my job if I had known how difficult it is to find another one.
I would have taken a photo if I had brought my camera with me.
He would have died if the ambulance hadn't arrived quickly.
She would have gone to your birthday party if she hadn't been sick.
He wouldn't have become lost if he had taken the map with him.
The team would have won if the referee hadn't taken the bribe.
You wouldn't haved needed fillings if you had brushed your teeth more frequently.
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