since和for的两人外句子

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since和for的两人外句子
He has been dead for three years.
He has been dead since three years.
It is three years since he died.
这三句话,1,2句中的for 和since在这里是一样的用法
请指教了!
混了

现在完成时常和since引导的短语或从句,或由for引导的表一段时间的短语连用.
第一句是对的.for接一段时间,since接一个时间点.
因此第二句He has been dead since three years.应该在后面加上ago,表示一个时间点.
第三句应该是现在完成时,It has been three years since he died.

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