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　　在每一次的SAT考試?yán)?，有關(guān)語法部分針對邏輯主語判斷的考察基本上已經(jīng)占據(jù)了三分之一，這算是一個相當(dāng)大的比例。盡管此方面大部分題目類型都很淺顯易懂，有的更甚一步能夠找出答案，但考官若換一個出題思路，而不加以提示，大家是會陷進其套。所以在此要告訴大家的是警惕SAT語法中的邏輯主語問題。本文環(huán)球教育小編為了幫助SAT考生快速的理解這個問題同時掌握解決辦法，特別整理了SAT語法的邏輯主語兩大考點。

　　SAT語法的邏輯主語考點一、邏輯主語問題的常見有下面幾種形式：

　　1. 句子以現(xiàn)在分詞開始

　　例如，Lacking good instruction, my mistakes in creating a graph to illustrate historical trends were numerous.( 句子以現(xiàn)在分詞lacking開始)

　　my mistakes in creating a graph to illustrate historical trends were numerous

　　I made numerous mistakes in creating a graph to illustrate historical trends

　　there were numerous mistakes in the graph I created to illustrate historical trends

　　I created a graph to illustrate historical trends with numerous mistakes

　　The graph I made for illustrating historical trends had numerous mistakes

　　2. 句子以過去分詞開始

　　例如，Carried by the strong, dry winds of the stratosphere, the 1980 eruption of Mount Saint Helens caused dust thatcrossed the United States in three days and circled the globe in two weeks. (句子以過去分詞carried開始)

　　the 1980 eruption of Mount Saint Helens caused dust that

　　Mount Saint Helens’ eruption in 1980 caused dust that

　　dust from the 1980 eruption of Mount Saint Helens

　　dust from the 1980 eruption of Mount Saint Helens that

　　there was dust from the 1980 eruption of Mount Saint Helens and it

　　3. 句子以介詞加分詞開始

　　例如，By simply entering an internet website or calling a toll-free number, a catalog order can be placedfor almost anything from cheesecakes to fully equipped desktop computers. (句子以介詞by加分詞enteringor calling開始)

　　a catalog order can be placed

　　by placing a catalog order

　　they will place your catalog order

　　you can place a catalog order

　　your catalog order can be placed

　　解讀SAT語法中的邏輯主語考點圖2

　　SAT語法的邏輯主語考點二、修改方法

　　從語法上來說，若句子開始屬于分詞結(jié)構(gòu)，如此它的邏輯主語一定是整個句子的主語。在修改句子題里卻通常是相反的，相當(dāng)于是句子的主語不是分詞結(jié)構(gòu)的邏輯主語。修改的技巧是“一步必殺”法：把句子的主語替換成為分詞結(jié)構(gòu)的邏輯主語(一般藏在句子中)。正確答案通常就是以分詞結(jié)構(gòu)的邏輯主語為句子主語的選項。根據(jù)“一步必殺”法，上述句子修改如下。

　　1. Lacking good instruction, my mistakes in creating a graph to illustrate historical trends were numerous.

　　my mistakes in creating a graph to illustrate historical trends were numerous

　　I made numerous mistakes in creating a graph to illustrate historical trends

　　there were numerous mistakes in the graph I created to illustrate historical trends

　　I created a graph to illustrate historical trends with numerous mistakes

　　The graph I made for illustrating historical trends had numerous mistakes

　　如今分詞lacking的邏輯主語，相當(dāng)于是整個句子的主語應(yīng)該是“I”，但事實上卻是“my mistakes”。修改時只需要把句子的主語改成是“I”即可。符合此要求的有和2個選項，當(dāng)中選項將numerous mistakes放錯了位置，這樣讓整個句子意思荒謬。因此為正確答案。這也告訴考生，正確答案只要改正原句的主要錯誤就可以了，而無須做太多額外的修改，因為與原句相比，這么做將使改后的句子變得面目全非。

　　2. Carried by the strong, dry winds of the stratosphere, the 1980 eruption of Mount Saint Helens caused dust thatcrossed the United States in three days and circled the globe in two weeks. (句子以過去分詞carried開始)

　　the 1980 eruption of Mount Saint Helens caused dust that

　　Mount Saint Helens’ eruption in 1980 caused dust that

　　dust from the 1980 eruption of Mount Saint Helens

　　dust from the 1980 eruption of Mount Saint Helens that

　　there was dust from the 1980 eruption of Mount Saint Helens and it

　　過去分詞carried的邏輯主語，相當(dāng)于整個句子的主語算得上是“dust”(dust 被winds吹走)，而事實上卻是“eruption”。修改時只要求把句子的主語改成是“dust”即可。符合這個要求的有與兩個選項，其中選項保留了原句的that，使得that之后的crossed成了that引導(dǎo)的從句的謂語，也使得整個句子沒有謂語，因此為干擾選項， 為正確答案。

　　通過以上分析的SAT語法的邏輯主語兩大考點，希望大家可以針對文中介紹的方法進行有針對性的備考，預(yù)祝大家在SAT考試中取得好成績!