常用的关联词分为十一大类：

1.Additionin

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/thatfollowing this/that，afterwardsc

3. Consequence

as a result，thus，so，therefore，constantly，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 contraryotherwise，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，namel to illustrate

10. Reason

since，as，so，because(of)，due to，owing to，the reason why，in other wordsleads to，

11. Time

before，since，as，until，meanwhile，at the moment，when，whenever，as soon as，just as