一、举例

1) A good case in point is ...

2) As an illustration, we may take ...

3) Such examples might be given easily.

4) ...is often cited as an example.

二、证明

1) No one can deny the fact that ...

2) The idea is hardly supported by facts.

3) Unfortunately, none of the available data shows ...

4) Recent studies indicate that ...

5) There is sufficient evidence to show that ...

6) According to statistics proved by ..., it can be seen that ...

三、论证

1：From my point of view, it is more reasonable to support the first opinion rather than the second.(在我看来，支持第一种观点比第二种更有道理)

2：I cannot entirely agree with the idea that……(我无法完全同意这一观点)

3：As far as I am concerned/In my opinion,……(就我来说……)

4：I sincerely believe that……==I am greatly convinced (that)子句.(我真诚地相信……)

5：Finally, to speak frankly, there is also a more practical reason why ……(最后，坦率地说，还有另外一个实际的原因……)

四、推测

1：Obviously，if we don't control the problem, the chances are that……will lead us in danger.(很明显，如果我们不能控制这一问题，很有可能我们会陷入危险)

2：No doubt, unless we take effective measures, it is very likely that ……(毫无疑问，除非我们采取有效措施，否则我们很可能会……)

3：It is urgent that immediate measures should be taken to stop the situation(很紧迫的是应立即采取措施阻止这一事态的发展)