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
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