第一：直接提示观点、表递进关系的信号词 There are reason
why Firs... Second...Third What I want to talk about is... And most important,... A major development
... Why it was so important... A term for... It can be defined
in this way... In other words... In summary
... From this we see that... We may draw the conclusion
... The thing about... Remember that... The important idea is that... In addition Moreover/furthermore/what's more Equally important... Next I want to mention
... That brings us to... We'll be looking at a couple of ways to ...
第二：对比转折型信号词，提示转折后面的内容将非常重要 On the other hand... On the contrary
... In contrast... And in fact... By comparison
... Although this may be true,...
第三：因果型、总结型信号词，对上文往往是一种总结，后面信息往往非常重要 As a result,... For his purpose
... Therefore/ Consequently
/ Finally
In brief... On the whole... To conclude/ in conclusion/ in brief
/ To summarize
, to sum up As I have shown/ as has been noted/ as we have seen...