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)

will be 什么时态例如Mr.Reginald Page ,will be retiring next week. 非谓语形式的用法I have just received a letter from my old school,informing me that my former headmaster,Mr.Stuart Page,will be retiring next week.我想把informing me that 换成是 informed that my former headmaster,Mr.Stuart Page,will be r 请问这句话的informing me that my former headmaster怎么理解做什么成分I have just received a letter from my old school,informing me that my former headmaster ,Mr Stuart Page ,will be retiring next week. 请帮我分析一下下面句子中informing这个分词是作什么句子成分,I have just received a letter from my old school,informing me that my former headmaster,Mr Strart Page,will be retiring next week. 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) 新概念英语解析.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 ofthe school,old and new,will be sending him a present to mark the occasion.All those who h 概念二L85,Mr.Page will have been teaching for a total of forty years!这个时态是将来完成进行时吗 there ()an exerciting party at mr wang's this evening.1 will be 2be 3 will have 4 has this time tomorrow mr.brown _ his clothes into his suitcasesa.are packingb.will packc.will be packingd.will have packed 英语翻译P2P will be diffcult,if not next to impossible,to squash.Certainly,a Web page could be created,but for the sake of argument ...since most people have a broadband connection that sits around relativelyunused in terms of bandwidth will be,will be和will have的区别 求详解：Mr.Page will have been teaching for a total of forty years翻译过来是配齐先生已经执教满40年了为什么会要用will have been难道不是配齐先生将要完成40年的教师事业么?为什么会是已经完成呢 be going to will have – Excuse me,can I interview Mr.Miller this afternoon?-- A moment,please.Let me check .A.if Mr.Miller will be free B.when will Mr.Miller have time C.if Mr.Miller had an appointment D.when does Mr.Miller come back Believe me,always will be,a person you Mr. -Mr.wang ,i have a question to ask you.-be quick,i ( ) for an important meeting.A.will leaveB.am leavingC.have left D.will go为什么要选择B, 询问一道高二英语虚拟语气的题What do you think of Mr.Wang's suggestion that he ( )Mr Li to the party?A will invite B have invited C be invited D invited问下原因 contribute sth to也可以说成contribute to 另外还有contribute sth towards和contribute towards sth这是新概念2册85课原文：I have just received a letter from my old school informing me that my former head- master,Mr Regmald Page,will b