引语引语句子是four days later,如何变为间接引语?three days before 如何变直接引语?

引语引语句子是four days later,如何变为间接引语?three days before 如何变直接引语?
the day after tomorrow后天间接引语是two days later两天后.the day before yesterday前天变间接引语是days before两天前,如果句子中已经是,那变间接引语还需要变吗?要变是变为如何?three days before 变直接引语又是怎样的?

four days later --> after four days
three days before.-> before three days

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