1)主语从句
Why he would reject such a good offer remained unknown all these years.
Whether we can succeed or not depends upon our efforts.
What you have done for us will be in our memory forever.
It is common knowledge that honesty is the best policy.
It is well-known that…
It is self-evident that…
It goes without saying that…
It is universally acknowledged that…
2)宾语从句
They believe that the central government’s decision to develop the western part of the country and the success of Beijing’s bid to host the 2008 Olympics will open up further opportunities for the country’s development.
We cannot understand why he was so cruel to his roommates.
Experience from foreign countries suggests that no aircraft manufacturers can survive depending only on their domestic market.
3)表语从句
This is where she lived when she was young.
Quality is what counts most.
The problem is not who will go, but who will stay.
What we want to know is whether the government may take measures to tackle this problem.
The question is which one you may choose.
4)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 yuan is spent on cigarettes every year in our country, which is a huge waste.
The food supply will not increase nearly enough to match this, which means that we are heading into a crisis in the matter of producing and marketing food.
责任编辑：sealion1986
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