1、开头句型：as far as ...is concerned 就……而言
it goes without saying that...不言而喻，...
it can be said with certainty that...可以肯定地说......
as the proverb says，正如谚语所说的，
it has to be noticed that...它必须注意到，...
2、衔接句型：a case in point is ...一个典型的例子是...
as is often the case...由于通常情况下...
as stated in the previous paragraph 如前段所述
but it's a pity that...但遗憾的是…
3、结尾句型：i will conclude by saying...最后我要说…
therefore, we have the reason to believe that...因此，我们有理由相信…
therefore, in my opinion, it's more advisable...因此，在我看来，更可取的是…