after although as as if as long as as though because before even if even though
Coordinating Conjuntions: connect two independent clauses (there should be a comma before the second clause)
and but or yet for nor so
A Subordinating Conjunction (sometimes called a dependent word or subordinator) comes at the beginning of a Subordinate (or
Dependent) Clause and establishes the relationship between the dependent clause and the rest of the sentence. It also turns the clause into something that depends on the rest of the sentence for its meaning.
 He took to the stage as though he had been preparing for this moment all his life.
 Because he loved acting, he refused to give up his dream of being in the movies.
 Unless we act now, all is lost.
Notice that some of the subordinating conjunctions in the table below — after, before, since — are also prepositions, but as subordinators they are being used to introduce a clause and to subordinate the following clause to the independent element in the sentence.
An adverb clause is always introduced by a subordinating conjunction. A noun clause and adjective clause sometimes are.
Adverb clause: Before you go, sign the log book.
Noun clause: He asked if he could leave early.
Adjective clause: That is the place where he was last seen.
A subordinating conjunction is always followed by a clause. Many subordinating conjunctions can be other parts of speech.
Adverb: Jill came tumbling after.
Preposition: Jill came tumbling after Jack.
Subordinating Conjunction: Jill came tumbling after Jack had fallen.
if if only in order that now that once rather than since so that than that though till unless until when whenever where whereas wherever while

Here is a chart of the transitional devices (also called conjunctive adverbs or adverbial conjunctions ) accompanied with a simplified definition of function (note that some devices appear with more than one definition): addition comparison concession contrast emphasis example or illustration summary time sequence again, also, and, and then, besides, equally important, finally, first, further, furthermore, in addition, in the first place, last, moreover, next, second, still, too also, in the same way, likewise, similarly granted, naturally, of course although, and yet, at the same time, but at the same time, despite that, even so, even though, for all that, however, in contrast, in spite of, instead, nevertheless, notwithstanding, on the contrary, on the other hand, otherwise, regardless, still, though, yet certainly, indeed, in fact, of course after all, as an illustration, even, for example, for instance, in conclusion, indeed, in fact, in other words, in short, it is true, of course, namely, specifically, that is, to illustrate, thus, truly all in all, altogether, as has been said, finally, in brief, in conclusion, in other words, in particular, in short, in simpler terms, in summary, on the whole, that is, therefore, to put it differently, to summarize after a while, afterward, again, also, and then, as long as, at last, at length, at that time, before, besides, earlier, eventually, finally, formerly, further, furthermore, in addition, in the first place, in the past, last, lately, meanwhile, moreover, next, now, presently, second, shortly, simultaneously, since, so far, soon, still, subsequently, then, thereafter, too, until, until now, when