本文探讨了英语中零条件句的两种模式：如果+现在简单时，然后+现在简单时，表示当条件满足时，结果是百分之百产生的；以及如果+过去简单时，然后+过去简单时，表示在过去当条件满足时，结果是百分之百产生的。
A pattern of the zero conditional
If + present simple tense, present simple tense
Examples
If you heat ice, it melts.
= When you heat ice, it melts.
If metal gets hot, it expands.
The boy cries if you scold him.
It means when the condition is met, the result is 100 percent produced.
The other pattern is rare:
If + past simple tense, past simple tense.
If the kids didn't pass the examination, they failed the grade.
It means when the condition was met in the past, the result was 100 percent produced.
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