一 And 并列关系 （and）
in addition / and / similarly / likewise / as well as / besides / furthermore / also / moreover / too/ not only 。.. but / even / besides this/that
二 Sequence 顺序 （then）
出现的时候表示列举
first/ initially / second etc. / to begin with / then / next / earlier/later / following this/that / afterwards
三 Consequence 结果 （so）
前面是后面的结果 / 也就是这些词后面就开始给出结论了。
as a result/ thus / so / therefore / consequently / it follows that / thereby / eventually / tn that case / admittedly
四 Contrast转折 （but ） 来源：www..com
表对前面论述的转折 / 一般后面才是作者观点
