1.They will have been married for 20 years by then(将来完成时)
2.This time next day they will be sitting in the cinema(将来进行时)
3.Mr. Jackson decided to return to London next month. By that time he would have been working with us here for six years.(将来完成进行时)
杰克逊先生决定下个月回伦敦。到那时他在这里就已和我们一起工作六年了。
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