讨论开始：

What do you think of this subject?

What do you think about it?

What do you have in mind?

叙述观点：

In my opinion, ……

I think that ……First of all, ……Second, ……The last point is ……

表达同意或反对：

I can't agree with you any more. 我强烈同意。

I'm afraid that I can't agree with you. 恐怕我不能同意你的观点。

I really appreciate your idea, but……我很欣赏你的主意，但是……

结束用语：

Now we have come to a conclusion that ……

Finally, we drao a conclusion that……