1. addition
　　
in addition，and，similarly，likewise，as well as，besides，furthermore，also，moreover，and then，too，not only … but，even，besides this/that
　　
2. sequence
　　
first（ly），initially，second（ly） etc.，to begin with，then，next，arlier/later，after this/that   following this/that，afterwards
　　
3. consequence
　　
as a result，thus，so，therefore，consequently，it follows that，thereby，eventually，then，in that case，admittedly
　　
4. contrast
　　
however，on the other hand，despite，in spite of，though，although，but，on the contrary

otherwise，yet，instead of，rather，whereas，nonetheless，even though，
　　
compared with，in contrast，alternatively
　　
5. certainty
　　
obviously，certainly，plainly，of course，undoubtedly
　　
6. condition
　　
if，unless，whether，provided that，for，so that，whether，depending on
　　
7. definition
　　
is，refers to，means，that is，consists of

8. summary
　　
in conclusion，in summary，lastly，finally，to sum up，to conclude，to recapitulate
　　
in short
　　
9. example
　　
for instance，one example，for example，just as，in particular，such as，namely  to illustrate
　　
10. reason
　　
since，as，so，because（of），due to，owing to，the reason why，in other words
　　
leads to，cause
　　
11. time
　　
before，since，as，until，meanwhile，at the moment，when，whenever，
　　
as soon as，just as