1.表示转折：although, instead, rather than, but, nevertheless, though, however, on the other hand, otherwise
【例句】Nevertheless, as any biographer knows, a person’s early life and its conditions are often the greatest gift to an individual. The sobering aspect of Allen’s book is that we have no one else to blame for our present condition except ourselves.
2.表示结果和原因：because，since，so，as a result，therefore，hence，thus，otherwise
【例句】In effect, the White House claimed that it could invalidate any otherwise legitimate state law that it disagrees with.
3.表举例 for example ，to name a few, say , such as，to list but a few, for instance
【例句】 But in some cases， one marketer’s owned media become another marketer’s paid media-for instance， when an e-commerce retailer sells ad space on its Web site.
4.表递进 in addition, furthermore ,what’s more, what’s worse, additionally
【例句】Furthermore, the legal system and the events which occur within it are primary subjects for journalists.
5.表对比 whereas, while, as opposed to, by contrast, by comparison, on the contrary, oppositely, but, yet
6.表示时间：in general, every, some, sometimes, after, on the whole, usually, most, at other times, in most cases, frequently, main, finally, as a rule, rarely, before, meanwhile
7.表示时间顺序：now，then，before，after，afterwards，earlier，later，immediately，soon，next，in a few days，gradually，suddenly，finally
8.表示空间顺序：near...to ，far...from ，in front of，behind，beside，beyond，above，below，to the right(left)，around，outside
9.表示对照：but，still，yet，however，even though，on the other hand，on the contrary，in spite of
10.表示目的：for this reason，for this purpose，so that
11.表示强调：in fact，indeed，surely，necessarily，certainly，without any doubt，truly，to repeat，above all，most important
12.表示解释说明：for example，in fact，in this case，for actually