②句子和句子之間的銜接最直接地影響做出的選擇。雖然句子是相對獨立地表意單位,但各個句子之間并不是孤立的,上下文賦予了句子在整個文章中的完整含義。此句和其它句子之間的關系在字里行間會有各種提示線索:如指代關系:it, this, that, these, those, here, he, she;因果關系:as a result , hence, therefore, consequently, thus;轉折關系:though, but, however, in spite of, despite;承接關系:then, in addition, besides, in other words, moreover;列舉關系:for instance, for example;類比關系:by comparison, likewise, compared to等。