常用的关联词分为十一大类： 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