transitions

addition:again,also,and then,besides,equally important,finally,first,further, furthermore,in addition,in the first place,last,moreover,next,second, still,too
comparison:also, in the same way, likewise
concession: granted, naturally, of course
contrast: although, and yet, at the same time,but at the same time, despite that, evens so,even though, for all that, however, in contrast,in spite of
example/illustration: after all, as an illustration, for example, in conclusion,in other words, of course
summary: all in all, as has been said, finally, in conclusion, in other words, to summarize