连接词体现的是句子内部和句子之间严谨的逻辑和论证推理关系，是英语语言的特色。连接词是保证英语写作通顺连贯的一个重要因素。根据语法中的平行和从属结构原则，一个复合句中至少要有一个连接词，否则这个句子是不符合语法规则的。众所周知，复合句运用的好坏与否直接影响着考生的作文分数的高低，因此广大考生应该高度重视连接词在写作中的作用，为写作部分得高分添加筹码。为此，本文将连接词的用法总结如下，以供考生参考学习。
一、表示时间方位关系的连接词
at last immediately in the meantime lately meanwhile shortly afterwards presently since temporarily after while when...in (the) front of in (the) back of beyond above below inside outside beside on the left (right)...
二、表示次序关系的连接词
in the first place first of all to begin with initially finally to start with what is more furthermore moreover next for another besides in addition to first and foremost last but not least...
三、表示因果关系的连接词
because (of ) since for as due to owing to result in (from) on account of as a result of for the reason consequently as a consequence accordingly therefore hence consequently...
四、表示对比关系的连接词
instead yet however whereas nevertheless in contrast but rather than conversely otherwise on the contrary likewise similarly in the same way like on the other hand...
五、表示举例关系的连接词
such as for example for instance take...as an example a case in point namely that is like...
六、表示总结关系的连接词
on the whole to sum up to conclude in summary in a word on a large scale in brief in short as far as I am concerned to some extent generally speaking in a way to take the idea further as a rule in terms of in a sense...
七、表示让步关系的连接词
although even though in spite of despite even though granted that...
八、表示条件关系的连接词
providing that as long as no matter what whateverwhenever...
还有表示选择关系(如oreither...or... neither...nor...)，递进关系(even...)等的连接词，大家在学习及写作中要注意多总结多运用。
以下面的范文为例，考生可体会一下连接词在整篇作文中的作用和用法。
With the development of economy and technology there are more and more people using mobile phones. When(时间) you walk in a street you can see some people using their phones to chat to send short messages or to browse the micro-blogs even(递进) to watch videos.
Just as(例举)the picture shows some people are using their phones while(时间) they are crossing the street. How dangerous it is to do this way. There are many traffic tragedies due to (因果)the inattention to traffic lights. Though(转折) the stick can help you the stick doesn’t have a pair of eyes and it cannot tell you the dangers in front of(方位) you. There are many other disadvantages of overusing mobile phones such as(列举) making our eyes near-sighted having less face-to-face communication with our friends and so on(列举).
The mobile phone definitely brings much convenience to our life but(转折)we cannot overuse it. We should make a good use of it and(并列) benefit from it.
由此篇范文可以看出，句子之间的连贯需要有连接词来构筑，复合句内部必须要有连接词。甚至段与段之间也需要连接词，以达到通顺、逻辑清晰的效果。