1.表明事件发生的时间顺序：
then, first, at once, next, after that, previously, while, when, the following day, etc.
2.表明文章的组织结构:
1)Listing:
firstly, in the first place, secondly, thirdly, my next point is, last/finally, etc.
2)Illustrating:
for example/ for instance, to illustrate, an example/ instance of this is, let’s take….., take…. for example, etc.
3)Re-stating:
in other words, that is to say, to put it another way, let me put it this way, or rather, namely, etc.
4)Referring:
in this respect, in that connection, as we said, apart from this, etc.
5)Resuming:
to resume, to return to the previous point, getting back to the argument, etc.
6)Summarizing:
to sum up, in short, it amounts to this, what I have been saying is this, etc.
7)Emphasizing:
it is worth noting, I would like to direct your attention to, let us consider, we must now turn to, I shall begin by, etc.
