Mr.Page will have been teaching for a total of forth years.在

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Mr.Page will have been teaching for a total of forth years.在这句话中,我想知道为什么要用will have been teaching(will have been doing)这个时态,而不是will have teached(have been done)

这是将来完成进行时 will have been doing 表示截止到将来某个时间一直持续的的动作
如果用将来完成时 will have teached表示动作发生截止到将来某个时间已经多长时间
前者强调动作发生并不间断一直进行到将来某个时间
后者强调动作发生到将来某个时间的时间
我认为二者意思差不多用完成进行时不过强调一直进行而已 .
I have just received a letter from my old school,informing me that my former headmaster,Mr.Stuart Page,will be retiring next week.Pupils of the school,old and new,will be sending him a present to mark the occasion.All those who have contributed towards the gift will sign their names in a large album which will be sent to the headmaster's home.We shall all remember Mr.Page for his patience and understanding and for the kindly encouragement he gave us when we went so unwillingly to school.A great many former pupils will be attending a farewell dinner in his honour next Thursday.It is a curious coincidence that the day before his retirement,Mr.Page will have been teaching for a total of forty years.After he has retired,he will devote himself to gardening.For him,this will be an entirely new hobby.But this does not matter,for,as he has often remarked,one is never too old to learn.

Mr.Page will have been teaching for a total of forth years.在概念二L85,Mr.Page will have been teaching for a total of forty 求详解：Mr.Page will have been teaching for a total of forty yea She's been teaching for five years,( ) 英语?They will have been married for 20 years by then.请问been在句 I have been teaching English in China for 5 years 与I have ta Mr Li has been a m___ of the Party for twenty years 英语翻译English,teaching,for,been,fire,have,years,I连词成句英语翻译I have been teaching for the last ten years.During that 这个英语错在哪儿i have been teaching here for 30 years when you grad I have joined the Part for 3years .I have been a member of t They will have been married for 20 years by then.