托福写作中有一项重要的考核标准，用恰当的例证有逻辑地对核心概念进行挖掘，因此评判托福作文的好坏，考官看重的一个重要的方面就是文章的思辨性，因此托福写作中常用的可以文章逻辑性的词汇很重要。
     1.  并列关系：and, furthermore, more than that, also, likewise, moreover,inaddition, what is more, for instance, for example.
    2.  转折关系：although, however, on the contrary, but, in spiteof,nevertheless, yet, otherwise, despite.
    3.  顺序关系：first, second, third, and so on, then, after, before, next.
    4. 因果关系：as a result, for, thus, because, for this reason, so,therefore,as, since,c**equently, on account of.
    5. 归纳关系：as a result, finally, therefore, accordingly, in short, thus, c**equently, in conclusion, so, in brief, in a word.
    几个用得比较多的逻辑句子：
    1. As far as I am concerned, the advantages of … 
    2. Nevertheless, the disadvantages of … is undeniable.
    3. To sum up/ In general/ On the whole/ In brief/ In short/ In a word, it is true that … bring about both positive andnegativeresults. But we can try our best to reduce the negative influenceto the least extent.
    4. Obviously, in every aspect, …
    5. This diagram unfolds a clear comparison between…and…
    6. As to the other three, though the growth rates were not sohigh,they were indeed remarkable and impressive.