零条件_第一条件_第二条件_第三条件
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在"if"引导的从句中，我们通常谈论不确定的事件和情况。
我们使用"if"来强调事情发生的条件。
另一种通常的用法是表明"if it is true that"。
特殊的时态能用于"if"之后来表示事情是想象中的。
最后，一个"if-clau"经常是这样的情形物理电阻知识点--一些事情必须在此之前发生，以后的事才能发生。
Zero Conditional: certainty
We u the so-called zero conditional when the result of the condition is always true, like a scientific fact.
第一种情况我们称为“零条件”，在这种情况下由条件引起的结果通常都是事实，比如科学现象。
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IF | condition | result |
母爱的名言 | prent simple | prent simple |
If | you heat ice | it melts. |
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First Conditional: real possibility
We are talking about the future. We are thinking about a particular condition or situation in the future, and the result of this condition. There is a real possibility that this condition will happen. For example, it is morning. You are at home. You plan to play tennis this afternoon. But there are some clouds in the sky. Imagine that it rains. What will you do?
第二种情形，我们称之为“第一条件”，表示在将来某个条件或前提下，会产生某个结果。这个发生在将来的前提条件确实可能发生。
IF | condition | result |
| prent simple | 春天画WILL + ba verb |
If | it rains | I will stay at home. |
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Second Conditional: unreal possibility or dream
The cond conditional is like the first conditional. We are still thinking about the future. We are thinking about a particular condition in the future, and the result of this condition. But there is not a real possibility that this condition will happen. For example, you do not have a lottery ticket. Is it possible to win? No! No lottery ticket, no win! But maybe you will buy a lottery ticket in the future. So you can think about winning in the future, like a dream. It's not very real, but it's still possible.
第三种情形，我们称之为“第二条件”，表示在将来某个条件或前提下，会产生某个结果。这个发生在将来的前提条件不太可能发生，但仍有发生的可能性。
IF | condition | result |
劳务个税计算器 | past simple | WOULD + ba verb |
If | I won the lottery | I would buy a car. |
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Third Conditional: no possibility
The first conditional and cond conditionals talk about the future. With the third conditional we talk about the past. We talk about a condition in the past that did not happen. That is why there is no possibility for this condition. The third conditional is also like a dream, but with no possibility of the dream coming true.
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Last week you bought a lottery ticket. But you did not win.
第四种情形，我们称之为“第三条件”，表示在过去某个条件或前提没有发生，只是想象在这样的前提下会产生某个结果。
IF | condition | result |
| Past Perfect | WOULD HAVE + Past Participle |
If | I had won the lottery | I would have bought a car. |
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