开头段:::

Does...?/Is...?

The speaker contends that......

(I fundamentally agree with his claim.../I strongly disagree with his claims.)

In my observation,......

This paredoxical result is apthy explained and illlustrated by a number of advances in...

正文段:::

The chief reason why I generally agree with the contention is that,for better or worse, ......, Several examples from ... serve to illustrate this point...

Another compelling argument for the speaker's assertion is that...

On the another hand...
The chief problem with the statement is that...

A second compelling argument against the sperker's position has to do with the...

结尾段:::

In sum, the proposed contention of... Nevertheless...