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.
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