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可尝试扩展句子。越复杂的句子,分析结果越丰富。
The telephone had been ringing for two minutes before it was answered.
这是一个复杂句。
The telephone had been ringing for two minutes
The telephone主语
had been ringing谓语动词(复合结构)(进行时)
for two minutes、before it was answered.it was answered.
这是一个状语从句,其时态为一般过去时。
it主语
was answered谓语动词短语(复合结构)(被动语态)