1)Introducing( or emphasizing) further evidence: moreover, furthermore, in addition, what's more, as well, etc.

　　2)Cause: because (of), since, owing to, on account of, due to, as a result of, etc.

　　3)Effect: as a result, hence, therefore, consequently, thus, so, etc.

　　4)Contrasting: in / by contrast, on the contrary, on the other hand, nevertheless, whereas, while, yet, however, but, etc.

　　5)Comparison: in like manner, likewise, in the same way, similarly, in comparison with, etc.

　　6)Purpose: to this end, for this purpose, with this in mind, in order to, so that, etc.

　　7)Intensification: indeed, in fact, in any event / case, at no time, to tell the truth, etc.