将来完成时的构成方法是“will have +过去分词”。如：
Hopefully after three years at university I will have matured. 希望3年大学生活之后我能变成熟。
Only five short years later, your money will have grown by $94,000. 仅短短 5 年时间后，你的钱就会增多 94,000 美元。
He will have been heartened by the telephone opinion poll published yesterday. 他会为昨天公布的电话民意调查结果感到鼓舞。
