之前我们讨论了：
下面讨论其中的Zero Conditional
When we are thinking about facts which are generally true, we use:
当我们考虑事实时（这些事实大多数是真的），我们使用：
If + Present Simple一般现在时, Present Simple一般现在时
If you put water in the freezer, it becomes ice.
If you stand in the rain, you get wet.
If you heat ice, it melts.
You can see in the examples about the the condition always has the same result.
你可以在例子中看到这些条件经常会有相同的结果。
Notice how we use a comma after the first present simple tense clause.
注意我们如何在第一个一般现在时从句后使用逗号。
We can also reverse the order and use:
我们也可以颠倒顺序：
Present Simple一般现在时 + If + Present Simple一般现在时
You get wet if you stand in the rain.
Ice melts if you heat it.
I can't sleep if I drink coffee at night.
Plants die if you don't water them.
Notice how the comma is not necessary with this word order.
注意这种单词顺序下，逗号就不是必须的了。
关注我，了解剩下的三种条件从句。
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