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相似短语
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可尝试扩展句子。越复杂的句子,分析结果越丰富。
There was a time when this village used to be very quiet.
这是一个复杂句。
There was a time when this village used to be very quiet.
There形式主语或倒装引导词
wasbe 动词
a time when ··· quiet.真实主语
when this village used to be very quiet.
这是一个定语从句,其时态为一般现在时。
this village主语
used to bebe 动词(复合结构)
very quiet.表语