托福阅读难除了有较大的词汇量之外，复杂的句子结构也是其难点之一，今天小马小编就为大家整理了托福阅读考试中的绊脚石，希望能对大家的复习有所帮助。
要把握托福阅读的难句的主干和重点，首先要弄清它们的类型。托福阅读中的难句主要有定语从句、同位语、并列结构、倒装句等等，对于不同类型的难句，把握主干的方法也不一样。下面以倒装句为例，为大家介绍一些把握倒装句的方法。
托福阅读中的倒装句主要有下列情况：
1.方位副词放在句首
Herein lay the beginning of what ultimately turned from ignorance to denial of the value of nutritional therapies in medicine。
2.介词放在句首
Among the species of seabirds that use the windswept cliffs of the Atlantic coast of Canada in the summer to mate， lay eggs， and rear their young are common murres， Atlantic puffins， black-legged kittiwakes， and northern gannets。
3. 形容词放在句首
Implicit in it is an aesthetic principle as well： that the medium has certain qualities of beauty and expressiveness with which sculptors must bring own aesthetic sensibilities into harmony。
4.过去分词放在句首
Accustomed though we are to speaking of the films made before 1927 as “silent”， the film has never been， in the full sense of the word， silent。
5.现在分词放在句首
Missing until recently were fossils clearly intermediate， or transitional， between land mammals and cetaceans。
托福阅读中为了考试时能迅速把握句子的主干，大家备考时需要进行更多的阅读和分析，每种托福阅读难句类型都有一定的练习，在不断的练习中自己总结不同类型考题的答题技巧。