表示原因的用语，例如：

　　The age of the product was a contributory factor in the accident.

　　预计结果用语，例如：

　　We can anticipate the following consequences:…

　　表示需要考虑，例如：

　　Let us focus our attention on…

　　举例用语，例如：

　　Here, I am just showing you a few examples of …

　　展示胶片用语，例如：

　　Allow us, then, at this point to present some slides.

　　读报告的开场用语，例如：

　　My paper is a literature review.

　　提问用语，例如：

　　My I ask a question? This is an extremely difficult question to answer.