下面網托福測驗頻道小編給眾人匯集整頓了托福瀏覽中四種常見邏輯幹系，願望對考生們的備考有所贊助！
第一種因果幹系
因：because, because of, for, as, since, in that, on account of,with
果：so, so that, therefore, thereby, as a result, hence, thus,consequently, accordingly
因果幹系除傳統意義上的顯性因果表達詞外，隱性的因果一樣是弗成疏忽的一個主要部門。
隱性因果：
A 致使(因-果)：cause, reason, lead to, give rise to, result in, render, make, let, ask, support,push, stimulate, spark, spur, fuel, produce, be responsible for
如The increased pressures of expanding populations have led to the removal of woody plants sothat many cities and towns are surrounded by large areas completely lacking in trees and shrubs.
在這段話中，有lead to， 表現了致使的意思，即成果; 而so that 更進一步表現了背面的成果，以是可以充足剖斷這段話有因果幹系的邏輯。
B 由…而來(果-因)：result from, derive from, originate from, initiate from, stem from, beresponsive to, be attributable to
如 “The extreme seriousness of desertification results from the vast areas of land and tremendousnumbers of people affected, as well as from the great difficulty of reversing or even slowing theprocess.”
在這段話中，依據result from可以揣摸出有因果幹系，那假如是說明句子題時，選項中有因果幹系就能夠優先斟酌。
C 反應，表現(果-因): reflect, present, demonstrate, suggest, imply, show
This result demonstrates that…中華測驗網
D 斟酌到: given, considering, in view of, thanks to, according to
He succeeded thanks to (in view of) his effort.
E 依附於: rely on, depend on, resort to,
He resorted to books when he had problems.
F 前提幹系：when, once, as soon as, as long as
As soon as he got the money, he would leave the country at once.
G 分詞短語，不定式做狀語
Failing in the final exam, she cried.
第二種比較遷移轉變幹系
A 比較：while, whereas, on the other hand
在說明句子題，插入句子題中，一旦湧現比較幹系，門生在控制的基本上就可以異常快速的剖斷句間和句內的幹系。While, whereas 先後銜接的是平行構造，on the other hand前一定有on one hand, 可以用來掌控句間幹系。
B 遷移轉變：but, although, despite, in spite of, nevertheless, however
第三種比擬幹系
A 同級比擬 as…as
B 比擬級：more…than, -er than, less…than
C 變更：change, alter, vary, modify, revise, increase, decrease, enhance, diminish, develop,progress, advance, improve, retreat, degenerate, continue, remain
D 差別：different, distinguish, separate, same, similar, comparable, compare…to
E 超出：surpass, exceed, excel, over
F 第一流
1)自己有第一流寄義：maximum, minimum, peak, outstanding, top
2) 自己水平比擬深：amazing, surprising, astonishing, prohibitively high
3) 否認+比擬=第一流
No one is more outstanding than him.
從這句話中可以看出，否認加比擬表現的是一種第一流幹系。
第四種否認幹系
顯性否認：no, not, never, nor, none neither
隱形否認：fail to, refuse, remove, miss, reject, absence of, lack of
否認前綴：a-, ab-, dis-, il-, im-, in-, non- , un-
否認前綴是辭匯題中常常出的一個考點，掌控否認前綴可以贊助考生掌控一些生詞，依附否認前綴對選項舉行一個消除。
兩重否認：not fail to, not illegal, not uncommon, not unavailable
兩重否認是英文中常常應用的表達方法，因為在日常平凡中文對話頂用的很少，隨便對兩重否認的掌控就顯得特殊的主要。
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