在研讀SC的時候，大家最常問的其中一個問題就是：關代子句何時能跳？何時不能跳？
也就是N1 + prep. + N2 +關代子句，到底要抓N1 還是N2的問題。
網路上流傳著各種不同的判斷準則，莫衷一是
有人說非限定可跳限定不能的、有人說which可以that不能的、有人說中間隔的介係詞片語太長不能的......（太長的定義是什麼？只能憑感覺吧）
在這裡，我有一個明確的判斷準則。
先說一下我的結論：我認為「跳躍」兩字是誤導，修飾語根本不是跳躍。
原因將會在稍後敘明。
先舉官方題目的兩個有跳躍修飾的正確句子為例：
1. Marconi conceived of the radio as a tool for private conversation that could substitute for the
先舉官方題目的兩個有跳躍修飾的正確句子為例：
1. Marconi conceived of the radio as a tool for private conversation that could substitute for the
telephone.
2. Barbara Jordan did not become a nationally recognized figure until 1974, when she participated in
2. Barbara Jordan did not become a nationally recognized figure until 1974, when she participated in
the hearings on the impeachment of President Richard Nixon, which were televised nationwide.
前面所講的傳言不攻自破。
1是限定、2是非限定
前面所講的傳言不攻自破。
1是限定、2是非限定
1是that、2是which
1是跳過一個介係詞片語，2卻是跳過長長的兩個介係詞修飾the hearings
所以，我們勢必得重建觀念。
其實，所謂的「跳躍修飾」，應該正名為「包覆修飾」
1是跳過一個介係詞片語，2卻是跳過長長的兩個介係詞修飾the hearings
所以，我們勢必得重建觀念。
其實，所謂的「跳躍修飾」，應該正名為「包覆修飾」
讓我們來幫剛剛兩個句子重新標示：
1. Marconi conceived of the radio as a tool for private conversation that could substitute for the
1. Marconi conceived of the radio as a tool for private conversation that could substitute for the
telephone.
此處a tool for private conversation在句意上可以被視做一個單一概念的名詞，
for private conversation被當做形容詞片語「作為私人溝通之用的」
因此，a tool for private conversation在句意上可以被視做是一個加上形容詞的名詞：
「作為私人溝通之用的」＋「工具」＝「作為私人溝通之用的工具」
that could substitute for the telephone.的關代子句
「作為私人溝通之用的」＋「工具」＝「作為私人溝通之用的工具」
that could substitute for the telephone.的關代子句
是把作為修飾語的介係詞片語跟名詞「包覆」在一起，視為一個單一概念的大名詞來修飾。
只是因為a tool for private conversation這個大名詞的核心成分始終是a tool
只是因為a tool for private conversation這個大名詞的核心成分始終是a tool
所以我們才誤以為關代跳過for private conversation不理，只去修飾a tool。
事實上，關代子句的正確還原應為：
事實上，關代子句的正確還原應為：
a tool for private conversation could substitute for the telephone.
而非
而非
a tool could substitute for the telephone.
2. Barbara Jordan did not become a nationally recognized figure until 1974, when she participated in
2. Barbara Jordan did not become a nationally recognized figure until 1974, when she participated in
the hearings on the impeachment of President Richard Nixon, which were televised nationwide.
同理，which並非跳過President Richard Nixon跟impeachment，
而是把the hearings on the impeachment of President Richard Nixon
同理，which並非跳過President Richard Nixon跟impeachment，
而是把the hearings on the impeachment of President Richard Nixon
「包覆」視為完整概念的大名詞：「尼克森總統彈劾聽證會」
只是因為核心成分是the hearings，所以我們才一直誤以為中間的介係詞片語被跳過了。
關代子句的正確還原應為：
the hearings on the impeachment of President Richard Nixon were televised nationwide.
而非
the hearings were televised nationwide.
概念講解結束。那大家一定會問，有沒有不能跳過的情況？
The machine wrote the letter with a pen, which....
這裡的which絕對不可能跳過with a pen這個介係詞短語，
只是因為核心成分是the hearings，所以我們才一直誤以為中間的介係詞片語被跳過了。
關代子句的正確還原應為：
the hearings on the impeachment of President Richard Nixon were televised nationwide.
而非
the hearings were televised nationwide.
概念講解結束。那大家一定會問，有沒有不能跳過的情況？
The machine wrote the letter with a pen, which....
這裡的which絕對不可能跳過with a pen這個介係詞短語，
因為句意上"the letter with a pen"是不可能被包覆成為單一概念的名詞的。
當然，更不能跳過動詞wrote，修飾主詞machine。
結論：
當然，更不能跳過動詞wrote，修飾主詞machine。
結論：
跳躍修飾，其實就是「包覆修飾」。
若「N1 + prep. + N2 +關代子句」中的「N1+ prep. + N2 」可以被視做單一概念的名詞
（換言之，prep. N2是拿來修飾N1）則可以包覆起來視為一個大名詞，
修飾大名詞的核心成分N1（也就是大家常講的跳過去修飾N1）。
若是無法視作單一概念的名詞，則絕不能跳過。
若是無法視作單一概念的名詞，則絕不能跳過。
