连接词分为并列连词和从属连词。英文连接词是连接英文单词的词，如also，and等。英语有486,000个左右的单词，而连接词却只有70个左右，它们总是非常高频率的出现在各类文章、对话、电邮等英语实际沟通中。
英文连接词像胶水一样将相关联的句子连接起来，国际心理学家、语言学家、教育家Chris Lonsdale 龙飞虎又把它称之为“胶水词”。
下面让我们来熟悉一下常用的英语连接词包括哪些：
（1）表示承接的过渡词：also,and,and then,too,in addition,furthermore,moreover,what's more,again,on top of that,another,first,second,third等.
（2）表示时间顺序的过渡词：
now,then,before,after,afterwards,earlier,later,immediately,soon,next,in
a few days,gradually,suddenly,finally··等.
（3）表示空间顺序的.过渡词：near（to）,far（from）,
in front of,behind,beside,beyond,above,below,to the right/left,around,outside等.
（4）表示比较的过渡词：in the same way,just like,just as等.
（5）表示转折的过渡词：but,still,yet,however,nevertheless,nonetheless,on the contrary,in spite of,even though等.
（6）一方面,另一方面：on the one hand,on the other hand,for one thing,for another等.
（7）表示结果和原因的过渡词：because,since,so,as a result,therefore,then,thus,otherwise等.
（8）表示目的的过渡词：for this reason,for this purpose,so that等.
（9）表示强调的过渡词：in fact,indeed,surely,necessarily,certainly,without any doubt,truly,to repeat,above all,most important等.
（10）表示解释说明的过渡词：for example,in fact,in this case,for actually,for instance等.
（11）表示总结的过渡词：in a word,above all,all in all,finally,at last,in conclusion,as I have shown,in another word,in brief,in short,in general,on the whole,as has been stated,last but not least等.
(12)表示转折的过渡词:But,However,Although / even though,Despite / despite the fact that,In spite of / in spite of the fact that,Nevertheless,Nonetheless,While,Whereas,Unlike,In theory… in practice