语篇是交际的基本单位，同时也是语言教学的根本任务。如果一篇文章支离破碎，缺乏必要的衔接和连贯，那么文章中使用的单词再丰富，语法结构再复杂，也不能完全达到与目标读者交流的目的。因此句组中的各个句子之间、句组与句组之间需用不同的衔接手段（cohensive devices）来体现语篇的粘着性和意义上的连贯性。衔接手段多种多样，运用逻辑联结语（logical connectors）就是高中 阶段常用的衔接手段之一。根据英语语言学家M.A.K. Halliday 和R. Hasan的语篇衔接理论, 逻辑联结语主要有以下几类:
(1) 表示平行、对等或选择关系
and, both…and, as well，as well as, neither…or, also not only…but also等。
(2) 表示转折关系
but, yet, however, nevertheless, in spite of, although, on the contrary，on the other hand，otherwise, while等。
(3) 表示因果关系
so , therefore, as a result (of), because, owing to, due to ,thanks to , on account of，seeing that等。
(4) 表示时间顺序关系
shortly after; first、second…，then, next, finally, immediately, suddenly, soon, in the end, eventually等。
（5）表示空间顺序关系
here, there, on the right/left，on the side of… on the other side of，on the foot/top/end，in the middle/center of/back/front of， next to等。
(6) 表示对称关系
on the one hand, on the other hand ; for one thing, for another thing等。
(7) 表示递进、强调关系
besides, furthermore，what's more, in addition, moreover, worse still, above all, certainly，important of all , to make matters worse. not only…but also，after all，in fact等。
(8) 表示解释、说明关系
namely, actually, such as ,for example/ instance, that is to say ,in other words, and so on, to tell you the truth, according to this，believe it or not，to tell you truth等。
(9) 表示结论
In short, in brief ,in a word, in general, as you know, as far as I know ,on the whole，in conclusion等。
下面以NMET2006年福建高考作文的范文加以分析：
Dear friends,
As we all know, we are what we eat. Therefore, it’s a very important for us to from healthy eating habits. However, bad eating habits are still very common among us students. Some of us often go to school without breakfast; some like to have snacks; some others are particular about food; and still some eat or drink too much. All these bad habits will surely have a bad effect on our health.
In order to keep fit, we should have various healthy diets, which generally include proper amounts of fish, meat, vegetables, fruit as well as main food. Besides, we’d better have meals regularly.
In my view, we should try to develop healthy eating habits to build up a strong body. Only in this way can we have enough energy to concentrate on our study better.
That’s all. Thank you!
点评：
（1）运用了大量的衔接词和较高级词汇： 如，Therefore, However, and still
Particular, have a bad effect on, various, generally, amounts of, as well as ,besides, regularly, In my view ,develop ,build up ,concentrate on.
（2）语言结构灵活充实，富有变化（见划线部分）。如，运用了非限制性定语从句， 不定式作目的状语，以及倒装句。用Some of us …some …some others… and still some…把部分同学的饮食习惯有机的表达出来,增强了句子间的紧凑感, 使得行文通达顺畅。
这些高级词汇和结构大大提高了文章的档次，关联词的恰当使用无疑增强句子间的逻辑性和紧凑性。令阅卷者对后续的句子产生心理期待和准备，从而获得理想的分数。
