英语写作是一项综合能力，要想写出一篇好的文章。首先，平时的基础一定要打好。单词和语法是最重要的，词汇量的多少直接影响写作。而单词需要依靠平时的积累，俗话说冰冻三尺非一日之寒，所以制定学习时间是提升英语成绩的关键。

　1)主语从句

It is common knowledge that honesty is the best policy.

It is well-known that…

It is self-evident/ conceivable / obvious / apparent that…

It goes without saying that… It is universally acknowledged that…

It is / that

2)宾(表)语从句

We cannot understand why he was so cruel to his roommates.

The problem is not who will go, but who will stay.

3)定语从句(限定性和非限定性)

As is shown/ demonstrated/ illustrated/ depicted/ described…in the cartoon/ picture/ graph/ table…,

There are many reasons why I want to study in your university.

It is estimated that tens of billions of pounds is spent on cigarettes every year in our country, which is a huge waste.

4)状语从句(时间，原因，地点，条件，让步，转折等)

When the man is enjoying the cigarette, the smoke becomes a monster (怪物) which will devour him.

Whatever the reason, there are still some problems with student use of computers.

　5)分词短语做定语或状语

Prof. Kang came to our university, giving us a lecture on how to acquire English better.

　6)倒装句

Only through these measures can we hope to solve the problem.

Scattered around the globe are more than 100 small regions of isolated volcanic activity known to geologists as hot spots.

7)被动句

Some measures should be taken to deal with the problem.

He is said to have accomplished a lot of great deeds.

Many people believe that…(It is believed that…)

8)设问句

Do you still remember the boy who cried wolf for several times so no one would trust him?

要想学好英语，除了依靠词汇的积累还需要有广泛的阅读。平时可以听一些英语广播，尝试跟读，可以学习语法。而要想提高写作能力，平时要加强基础写作训练，参考范文也学习的一种方法。以上是一些写作常用的语句，大家可以参考一下。