在指出或明示知识领域里的空白或提出了问题或假设之后，需告知读者本研究的报的和内容，要解决哪些问题，以填补上述空白或证明所提出的假设。

一、明确研究目的

根据当前研究问题来确立研究目的，可以采用目的性句式，也可以采用描述性句式。

（1）目的性句式主要有：

The aim of the present paper is to give...

The main purpose of the experiment reported here was to...

This study was designed to evaluate...

The aim of this investigation was to test...

It is the purpose of the present paper to provide...

（2）描述性句式有：

This paper reports on the results obtained...

In this paper we give preliminary results for...

This paper describes and analyzes...

In this paper, we report on...

The primary focus of this paper is on...

目的性句式通常用一般现在时或一般过去时，描述性句式通常用一般现在时。

二、介绍研究方法

明确研究目的后，一般要介绍研究方法，介绍研究方法的句式有：

Experiments on...were made to measure..

We carried out several sets of experiments to test the validity of.

We undertook the experiment to support the hypothesis of...

The working theory is based on...

The technique of...was applied to as...

The present investigation attempts to do this by using various samples.

三、关于本研究的其他信息

除研究目的、研究内容和研究方法外，有时还会简要介绍研究结果，使读者对结果有所预期，或者介绍接下来各章节的主要内容，或强调研究的贡献和价值。

表示研究贡献和价值的句式有：

All our preliminary results throw light on the nature of...

This fruitful work gives explanation of...

This pioneer work has contributed to our present understanding of...

This study has resulted in a solution of..