1. revealing addition :
and, also, in addition, besides that, furthermore, moreover, another reason, what is more , not only that ,on top of that, along with, together with, aside from, apart from, as well as, coupled with...

2. show results,
so, consequently, hence , then, therefore, thus, as a result, for thhis/that reason, accordingly, because of, because, since, the only way to do is, when it comes to, a good idea occurred to me, it matters to sb if, have a outing at, get information about, fell surprised at, it's evident that,

3 .showing opposition,
but, on the contrary , yet, however, nevertheless, on the other hand, in contrast, conversely, otherwise, although, while, notwithstanding,  despite all this, it's one thing to do...another to do...

4 .showing example,
for example, for instance, such as, one example of this is, as an illustaration, take the case of, to illustrate, let's take, take..for example, as an example, in particular, to begin with, to start with, for a start

5 .showing similarity,
and , in like manner, in the same way, likewise, similarly,

6. showing summary
in conclusion, to summarize, to conclude, in short,

7. showing time,
when, while , before, after, since, until, as , once, ago, anymore, still, yet,

8. showing chronological sequence
first, second, third, then ,next, later, finally,

9. showing pysical relationship
around, near, next to, beside, on top of, above, in front of ,behind, in back of, at the right, at the left, under, beneath,

10. showing emphasis
indeed, in other words, in fact , above all, more importantly

11. showing explanation
that's to say, the reason why... is, for those reasons, I mean, actually, that is to say(formal especially if not spoken using the contracted form), in other word, in fact, in actual fact, as a matter of fact

12. showing goal
to this end, for this purpose, with this in mind, in order to, so that