常用的连词：
1)表层次:
first,firstly,to begin with,further,in the first place
second,secondly,to start with,still,furthermore
third,thirdly,what is more,last,last but not least
also,and then,next,besides
and equally important too moreover
besides in addtion finally
2)表转折；
by contrast although though yet
at the same time but despitethe fact that even so
in contrast nevertheless even though for all that
notwithstanding on the contarary however in spite of
on the other hand otherwise instead still
regardless
3)表因果；
therfore consequently because of for the reason
thus hence due to owing to
so accordingly thanks to on this account
since as on that account in this way
for as a result as a consequence
4）表让步：
still nevertheless concession granted naturally
in spite of all the same of course despite
even so after all
5)表递近：
furthermore moreover likewise what is more
besides also not only...but also...
too in addtion
6)表举例：
for example for instance for one thing that is
to illustrate as an illustration a case in point
7)表解释：
as a matter of fact frankly speaking in this case namely
in other words
8)表总结：
in summary in a word thus as has been said
in brief in conclusion altogether in other words
to conclude in fact finally in simpler terms
indeed in short in particular that is
in other words of course on the whole to put it differently
namely in all therefore to summarize