混合条件句
条件句的两个子句指的是不同时间，是有可能的；而在这种情况下，主要子句（表示结果）为「混合条件句」 。混合条件句有两种：
过去的条件/情况对现在的结果
型态
在这类混合条件句，if 子句的时态为过去完成时，而主要子句的时态为条件式现在时。
| if 子句（条件/情况） | 主要子句（结果） |
|---|---|
| if + 过去完成时 | 条件式现在时 |
| If this thing had happened | that thing would happen. |
就如所有条件句，子句的顺序并没有硬性规定。当您要改变子句的顺序时，必须重新安排代词的位置，以及调整标点符号，但意思基本上是一样的。
举例
- If I had worked harder at school, I would have a better job now.
- I would have a better job now if I had worked harder at school.
- If we had looked at the map we wouldn't be lost.
- We wouldn't be lost if we had looked at the map.
- If you had caught that plane you would be dead now.
- You would be dead now if you had caught that plane.
作用
这种混合条件句论及过去的一个不真实的情况，以及该情况在现在可能会有的结果。这些句子表达的情况与过去和现在的事实都是相反的。在这类混合条件句中，if 子句的时间指的是过去，而主要子句的时间指的是现在。
举例
- If I had studied I would have my driving license.（但我没有努力准备，而且现在还没有驾照）
- I would be a millionaire now if I had taken that job.（但我没有接下那份工作，现在我也不是百万富翁）
- If you had spent all your money, you wouldn't buy this jacket.（但你没有花掉所有的钱，现在你可以买下这件夹克）
在混合条件句中，您也可以在主要子句用情态助词取代 would，以表达肯定程度丶允诺或有关结果的建议。
举例
- If you had crashed the car, you might be in trouble.
- I could be a millionaire now if I had invested in ABC Plumbing.
- If I had learned to ski, I might be on the slopes right now.
现在或持续的情况对过去的结果
型态
在这类混合条件句中，if 子句的时态是一般过去时，而主要子句的时态是条件式完成时。
| if 子句（条件/情况） | 主要子句（结果） |
|---|---|
| if + 一般过去时 | 条件式完成时 |
| If this thing happened | that thing would have happened. |
就如所有条件句，子句的顺序并没有硬性规定。当您要改变子句的顺序时，必须重新安排代词的位置，以及调整标点符号，但意思基本上是一样的。
举例
- If I wasn't afraid of spiders, I would have picked it up.
- I would have picked it up if I wasn't afraid of spiders.
- If we didn't trust him we would have sacked him months ago.
- We would have sacked him months ago if we didn't trust him.
- If I wasn't in the middle of another meeting, I would have been happy to help you.
- I would have been happy to help you if I wasn't in the middle of another meeting.
作用
这些混合条件句论及现在的一个不真实的情况，以及该情况在过去可能会有的结果（但只是虚设）。在这些混合条件句，if 子句的时间指的是现在或随时，而主要子句的时间指的是过去。例如：「If I wasn't afraid of spiders」（ 要是我不怕蜘蛛）与现在事实相反，事实上是「我怕蜘蛛」。而「I would have picked it up」（我早就会捡起它了）也是与过去事实相反，实际上我并没有捡起来过。
举例
- If she wasn't afraid of flying she wouldn't have travelled by boat.
- I'd have been able to translate the letter if my Italian was better.
- If I was a good cook, I'd have invited them to lunch.
- If the elephant wasn't in love with the mouse, she'd have trodden on him by now.