1) 先后次序关系：at this time; first; second; at last; next; previously;
simultaneously; eventually; last but not least; to begin with; to start
with; to end with; finally; seeing...; since then; first of all; afterwards;
following this; preceding this.
2) 因果关系：because; because of this; being that; another im...
（1）表示增补，如：and, also, too, in addition, moreover, besides,furthermore, not only———but also, above all, as well as, togetherwith, along with, next, what’s more.（2）表示时间，如after, before...
