① 表示举例

　　a case in point, after all, as a proof, as an illustration, as an example, for example, for instance, in particular, just as, namely, specifically, to illustrate, to demonstrate.

　　② 表示增补

　　additionally, along with, also, as well as, besides, equally, even, furthermore, in addition, just as, moreover, not only…but also…, what’s more

　　③ 表示强调

　　above all, as a matter of fact, indeed, in fact, most important, obviously, to be sure, truly ,undoubtedly, without doubt

　　④ 表示比较

　　by comparison, equally ,equally important, in comparison, in the same way, in the same manner, likewise, similarly

　　⑤ 表示让步

　　admittedly, after all, all the same, although, even so, in spite of, nevertheless

　　⑥ 表示结果

　　accordingly, as a result, consequently, for this reason, hence, in this way, so, therefore, thus.

　　⑦ 表示转折

　　although, but, despite, except for, though, however, in spite of, instead, nevertheless, on the other hand, otherwise, rather than, though, yet.

　　⑧ 表示结论

　　as has been noted(mentioned, stated), at last, finally, in a word, all in all, in brief, in conclusion, in short, in sum, in summary, to conclude, to sum up , to summarize.