名词短语
中文翻译：假设条件句同义词
同义词：
['if-then', 'if-only', 'if-but']
例句：
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1. If I had known about this earlier, I would have acted differently.
如果我早些时候知道这件事，我会采取不同的行动。
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2. He said he would come if the weather was good, but it rained instead.
他说他如果天气好就会来，但雨却下了起来。
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3. The scientist made an assumption that the earth would be flat, but now we know it's round.
科学家做了一个假设，认为地球是平的，但现在我们知道它是圆的。