在英語六級作文寫作過程中，好的`句型能提升整篇文章的質量，而文章主題句，作爲整篇文章的重點句型，更是起到了非常重要的作用。
1)主語從句
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)賓語從句
We cannot understand why he was so cruel to his roommates.
The problem is not who will go, but who will stay.
3)定語從句
As is shown/ demonstrated/ illustrated/ depicted/ describedin 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)狀語從句
When the man is enjoying the cigarette, the smoke becomes a monster which will devour him.
Whatever the reason, there are still some problems with student use of computers.
5)分詞短語做定語或狀語
Prof. Kang came to our university, giving us a lecture on how to acquire English better.