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When I noticed the puzzled look on his face, I realized that

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When I noticed the puzzled look on his face, I realized that he didn't understand me
句首的when为什么不能用until代替
When I noticed the puzzled look on his face, I realized that
用until时它的主句的谓语动词要用延续性.但realize并不是.所以不用.如
We waited until they came back.
再问: He didn't come back until I went to sleep. come 可以算延续性动词吗
再答: 主句是否定句谓语动词要用非延续性动词。如你说的句子。当主句是肯定句,谓语动词是延续性的。