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I have been sick since yesterday.中have been 是什么是时态为什么要用been.
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I have been sick since yesterday.中have been 是什么是时态为什么要用been.
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答案和解析
这个是现在完成进行时,
因为句意是从昨天开始一直生病,为了表示一种持续的状态,
所以要用现在完成进行时.
因为句意是从昨天开始一直生病,为了表示一种持续的状态,
所以要用现在完成进行时.
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