托福閱讀的長難句是其標志性難點之一，也是很多同學看不懂看不快閱讀文章的罪魁禍首。其實長難句只是一個統稱，其中包含了多種復雜的句式結構。下面小編就為大家重點分析其中的倒裝句式，一起來看。

1. 虛擬條件句謂語含were, had, 或should

如果虛擬條件句的謂語部分含有were, had, 或should, 可以把他們放到句首,省略連詞if,變成倒裝句。

真題例句1：In contrast, should another ice age occur, sea level would drop drastically.(TPO15-3 Glacier Formation)

解析：對于這種倒裝句的處理是：第一步，把if還原;第二部，理解句子。因此if還原之后該句變成：“In contrast, if another ice age should occur, sea level would drop drastically.”由if引導的從句“should occur”的使用可知，該句是對將來的虛擬。意思為：對比之下，如果再次發生冰川世紀，海平面將會大大下降

真題例句2：Their significance may have remained clear had the Chinese not come under foreign influence.(TPO10-1 Chinese Pottery 11題)

解析：該句是把條件從句放在了句子后面，if還原之后變成：“Their significance may have remained clear if the Chinese had not come under foreign influence.”由“had not come” 的使用可知該句是對過去的虛擬，意思為：如果中國沒有受到外國的影響，它們的重要性可能保持清晰。”

2. 否定意義形式詞或詞組位于句首

never等具有否定意義或否定形式的詞或詞組位于句首時用倒裝。

常見詞或詞組有： not, never, rarely, little, hardly, seldom, on no account, by no means, neither, nor … 　　因此，對于倒裝句“…not until the second of December did they kill their first elk.”來說，第一步先把句子變成正常語序，即把not的位置還原，第二步再理解句子。那么這個句子就變成“…they did not kill their first elk until the second of December。” “not…until”表示“直到……才”，因此句子意思為：他們直到第二年的十二月才殺死了第一批麋鹿。

3. “only+狀語”位于句首

當“only+狀語”位于句首時表強調使用倒裝。

真題例句：Only recently have investigators considered using these plants to clean up soil and waste sites…(TPO5-1 Minerals and Plants)

解析：該句是only+recently(時間狀語)位于句首引起的倒裝，因此該句變成正常語序為：“Investigators have only recently considered using these plants to clean up soil and waste sites…”,意思為：研究人員最近才考慮使用這些植物清理土壤和垃圾場。

4. “so/such…that”結構中的so或such位于句首

為加強語氣“so/such…that”結構中的so或such位于句首時用倒裝。

真題例句：“So admired were these pieces that they encouraged the development of earthenware made in imitation of porcelain and instigated research into the method of their manufacture.(TPO10-1 Chinese Pottery)

解析：該句是“so…that”結構中的so位于句首引起的倒裝，因此該句變成正常語序為：“These pieces were so admired that they encouraged the development of earthenware made in imitation of porcelain and instigated research into the method of their manufacture.”意思為：這些藝術品受到極高的贊賞，于是他們鼓勵制陶來仿制瓷器，并激勵人們研究制作方法。

5. 主語較長需平衡或強調句子

主語較長，為使句子平衡或強調，倒裝表語或狀語。

這種倒裝句通常是介詞短語、形容詞(短語)和分詞(短語)位于句首。

如： By his sides is his wife who is very elegant and beautiful.(在他旁邊是他美麗優雅的妻子)

Green are the clouds in the sky and faded are leaves on the ground.(碧云天，黃葉地)

Sitting in the class are students who come from all across the China.(坐在教室里的學生來自中國各地)

真題例句：Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans.(OG The Origins of Cetaceans)

解析：該句的主語是“fossils clearly intermediate, or transitional, between land mammals and cetaceans.”其中“intermediate, or transitional, between land mammals and cetaceans”(哺乳動物和海洋鯨魚之間過渡性)是“fossils”的定語。由于該句主語過長，為了使句子平衡，把表語“Missing until recently”置于句首引起倒裝句。該句變成正常語序為：“Fossils clearly intermediate, or transitional, between land mammals and cetaceans were missing until recently.”意思為“哺乳動物和海洋鯨魚之間過渡性的化石現在找到了。”

以上就是托福閱讀長難句中5大類倒裝句的結構實例分析，缺乏長難句基礎的同學趕緊來學習了解一下吧。