關係副詞：兼具連接詞和副詞的特性，如同關係代名詞，亦帶領關係子句作形容詞子句，修飾先行詞。
【觀念確認】關係副詞實則由關係子句中的介繫詞，前調which前，合併而來。
關係副詞： 事 / 時 / 地 / 理由 / 方式
介繫詞+ which = what / when / where / why / (how)
(1) 關係副詞係關係子句內的關係代名詞加介繫詞而來；關係副詞前的先行詞可以被省略，關係副詞子句，因此轉為名詞子句，而後方的介詞不須保留。
這是每個人都應遵循的規則
It is the rule which / that everyone should follow by. (關係代名詞which / that)
It is the rule by which everyone should follow. (介詞by前調關代which前)
It is the rule what everyone should follow. (by which =關係副詞what)
It is what everyone should follow. (關係副詞前的先行詞可以被省略)
這是你唯一可以擺放單車的地方
This is the only place that you can put the bike in. (關係代名詞that)
This is the only place in which you can put the bike. (介詞in前調關代which前)
This is the only place where you can put the bike. (in which =關係副詞where)
This is where you can put the bike. (關係副詞前的先行詞可以被省略)
你知道她是怎樣辦到的嗎?
Do you know the way that she did it by? (關係代名詞that)
Do you know the way by which she did it? (介詞by前調關代which前)
Do you know the way how she did it? (by which =關係副詞how)
Do you know how she did it? (關係副詞前的先行詞可以被省略)
你知道火車什麼時候會到站嗎?
Do you know the time which the train arrives at? (關係代名詞which)
Do you know the time at which the train arrives? (介詞at前調關代which前)
Do you know the time when the train arrives? (at which =關係副詞when)
Do you know when the train arrives? (關係副詞前的先行詞可以被省略)
這就是為什麼我不能來(的原因)
This is the reason which I cannot come for. (關係代名詞which)
This is the reason I cannot come for. (關係代名詞which受格可省略)
This is the reason for which I cannot come. (介詞for前調關代which前)
This is the reason why I cannot come. (for which = 關係副詞why)
This is why I cannot come. (關係副詞前的先行詞可以被省略)
註 讀者務必要在熟稔關係代名詞的前提之下，才能確實理解關係副詞形成的來龍去脈；以上例再復習一次：同一句子既可解釋為關係副詞why前的先行詞時可以被省略，或解釋為介詞for附屬於先行詞the reason，the reason和which合併為關係代名詞why，附屬於先行詞the reason的for可以被省略，亦可解釋為句中的間接問句；請細細品味其演變的過程，當您有一種“原來如此”的感覺時，那種感覺就是“天啟：Revelation”，從此英文與您天人合一矣。
(2) 關係副詞係由關係子句內，附屬於關係子句的動詞片語的介詞而來，關係副詞前的先行詞若被省略，則後方的介詞須保留。
這就是我正在找的那本書(東西)
This is the book which I am looking for. (關係代名詞which)
This is the book for which I am looking. (介詞for前調關代which前)
This is the book what I am looking. (for which =關係副詞what)
This is what I am looking for. (關係代名詞what = the thing which，for須保留)
這就是我一直在等待的時機(時間)
This is the time which I am waiting for. (關係代名詞which)
This is the time for which I am waiting. (介詞for前調關代which前)
This is the time when I am waiting. (for which =關係副詞when)
This is when I am waiting for. (關係代名詞when = the time which，for須保留)
這就是李白造訪過的寺廟(地方)
This is the temple which Li Po called at. (關係代名詞which)
This is the temple at which Li Po called. (介詞at前調關代which前)
This is the temple where Li Po called. (at which =關係副詞where)
This is where Li Po called at. (關係代名詞where = the place which，at須保留)
米飯是中國人賴以為生的主食
Rice is the main food which Chinese lives on. (關係代名詞which)
Rice is the main food on which Chinese lives. (介詞on前調關代which前)
Rice is the main food what Chinese lives. (on which =關係副詞what)
Rice is what Chinese lives on. (關係代名詞what = the thing which，on須保留)
(3) 關係子句內的動詞，若為及物動詞，則無法形成關係副詞，而是由關係代名詞which，合併前方的先行詞，亦稱為關係代名詞。
關係代名詞：what, where, when, why = 先行詞+ which
關係代名詞： 事 / 時 / 地 /理由
先行詞+ which = what / when / where / why
What = the thing which
Where = the place which
When = the time which
Why = the reason which
己所不欲勿施於人
I would not do to others the thing which I would not have them do to me.
I would not do to others what I would not have them do to me.
這是我上次來過的博物館
This is the museum which I last visited.
This is where I last visited.
我記不得那什麼時候(發生)的事
I can’t remember the time which that happened.
I can’t remember when that happened.
我了解他為什麼會這樣做(的原因)
I can tell the reason which he did so.
I can tell why he did so.
進階觀念 關係代名詞，關係副詞與間接問句：
沒有人知道這傳染病會(如何地)影響我們的生命(到怎樣的程度)
Nobody knows the extent which the epidemic would affect our lives to.
Nobody knows the extent to which the epidemic would affect our lives.
Nobody knows the extent how much the epidemic would affect our lives.
Nobody knows how much the epidemic would affect our lives.
沒有人知道一年會有幾次地震
Nobody knows the times which the earthquake would hit for in a year.
Nobody knows the times for which the earthquake would hit in a year.
Nobody knows the times how often the earthquake would hit in a year.
Nobody knows how often the earthquake would hit in a year.
沒有人知道那男人幾歲
Nobody knows the age which the man is at.
Nobody knows the age at which the man is.
Nobody knows the age how old the man is.
Nobody knows how old the man is.
觀念總結 關係代名詞，關係副詞以及間接問句的形成，實為一體，然而卻可以不同的文法角度去解釋，由以上例句，逐步演變的順序，有助於讀者了解整個關係代名詞，關係副詞以及間接問句彼此間的邏輯。
一、which是關係子句內，介詞後的名詞轉變而來的關係代名詞(受格)。
二、介詞加上which即變成了關係副詞。
三、含有介詞的關係副詞，依先行詞語意轉變成how的關係副詞。
四、省略how之前的先行詞後，又轉變成間接問句的句型。
註:通行文法書上多半認為how不是關係副詞，因此認為the way how是錯誤的
因此This is the way how I did it ，在考題上是被視為錯誤的，必須寫成This is how I did it 或This is the way that I did it 方可
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