据说，中国留学生在英文论文写作时，传统的三大主语分别是：people/ there be/ it。虽然不确定这个总结的权威性，但是不得不承认的是，大家写出来的句子，确实很像。而这种相似性，很多时候来自于句首的几个单词。
如果以 people 开始整句话，八成后面是一个比较简单的句子，people will 做什么事情，people should 做什么事情。如果是 there be，则后面跟一个名词，然后再加动词的时候，还可能会出现语法的错误（没有加 which，或者变分词）。
优秀：uses a wide range of structures
一般：uses a variety of complex structures
及格：uses a mix of simple and complex sentenceforms
如果句首的几个词出现了更多的可能性，比如 to do/ doing/ having done/ by/ so/ only if 等等，整句话怎么可能不丰富多样。
Undergraduates feel under increasing pressure, because of the soaring unemployment rate. 名词
→ Those who are about to graduate from university may feel under increasing pressure, because of the soaring unemployment rate. 代词
→ To find a decent and well-paid job seems to be increasingly difficult for the undergraduate. 不定式
→ Finding a satisfying career is no easy task for most undergraduates. 动名词
In contemporary society, moral education is an increasing important issue in the course of development.
Inevitably, those who resist tackling climate change point to the global nature of emissions as a reason not to act.
On aglobal scale, countries that supply capital equipment look like they will be the front-line beneficiaries of this package.
From linguistic perspectives, research on the minority languages and different dialects of a country is of high importance to understand the formation of a nation and certain races.
Through this way, the traditional culture will be kept from generation to generation.
As essence of a local culture, traditional arts reflect a nation’s artistic talents and traditions.
Artificial lighting at night is contributing to an alarming increase in light pollution, both in amount and in brightness, affecting places all over the world, a new study has found.
→ As is found in a new study, both in amount and in brightness, artificial lighting at night is contributing to an alarming increase in light pollution, affecting places all over the world.
如果句首不是直接出现主句，不妨先出现从句，根据相应的逻辑关系，选取合适的连词即可。大部分的从句，特别是状语从句，都可以放在句首，然后再写主句（so that 结果状语从句除外）。
除了各种状语从句（if/ when/ because/ although/ in order that/ where）之外，比较少用的主语从句，也可能出现在句首。
If the public transportation served this purpose, people would protest less about giving up their cars.
Even though students may find some subjects difficult, the experience of dealing with the challenges can be valuable to them.
Because tourists often carry expensive objects like cameras and are unaware of their surroundings, they make good targets for theft.
As economic conditions improve, many people maintain that government should spend money on great projects such as building stadiums, theatres and museums.
When a media outlet is forced to cover national and international news, it cannot address numerous interesting local stories because these stories are not of interest to very many viewers.
Whether the energy can be in the circulatory use affects our choice in so many alternative sources.
很多以 there be 或者 it 作形式主语开头的套句，都具有这样的功效。
There is no doubt that the relationship between family members is not as close as it used to be.
With the increasing level of globalization, more and more students choose to study in other countries.
Without government funding, hospitals have to make profit to survive.
It is an established fact that emissions from engines pollute the atmosphere.
There is a general acceptance that the government should balance its budget.
Having been inherited, developed, opened up and innovated, old style Chinese palace foods with new features are ready to serve you.
Invented less than a hundred years ago, computers are now used everywhere, even inside classrooms.
Considering the fact that there is only one car for every 580 Chinese at present, the potential auto market is extremely attractive.
Given the limited financial capacities of rural authorities and the large number of rural poor, a significant increase in government spending on healthcare is required.
Not having enough funding, the company had no choice but to temporarily stop the R& D plan.
这里篇幅有限，就不逐一展开讲解了，常见倒装之后可能放在句首的有：so/ only if/ only by/ 形容词/ not only/ hardly/ never/ not until 等。
Not only could the acquisition of a foreign language promote the children’s intelligence development, but also it could stimulate their interest for study and enrich their knowledge scope.
So serious is this problem that we have no alternative but to take some effective measures to solve this problem.
Only by continuous efforts to put a full stop into a comma and to pursue your goal can a perfect full stop be waiting for you in the front.
Not until the beginning of last century did people know electricity had a great impact on people's life.
Only in recent years have women begun to catch up with men in this area.
Splendid is the architecture of Manhattan, the heart of the city, with its hundred and more skyscrapers.