it is / thatas is shown/ demonstrated/ illustrated/ depicted/ describedin the ca
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/ 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)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?
9)比较
1.the advantages far outweigh the disadvantages。
2.the advantages of a are much greater than those of b。
3.a may be preferable to b， but a suffers from the disadvantages that.。。
4.it is reasonable to maintain that ...but it would be foolish to claim that.。。
5.for all the disadvantages， it has its compensating advantages。
6.like anything else， it has its faults。
7.a and b has several points in common。
8.a bears some resemblances to b。
9.however， the same is not applicable to b。
10. a and b differ in several ways。
11. evidently， it has both negative and positive effects。
12. people used to think ...， but things are different now。
13. the same is true of b。
14. wondering as a is ，it has its drawbacks。
15. it is true that a ... ， but the chief faults (obvious defects )are .。。
10)原因
1.a number of factors are accountable for this situation。
a number of factors might contribute to (lead to )(account for ) the phenomenon(problem)。
2. the answer to this problem involves many factors。
3. the phenomenon mainly stems from the fact that.。。
4. the factors that contribute to this
5. the change in ...largely results from the fact that.。。
6. we may blame ...，but the real causes are.。。
7. part of the explanations for it is that .。。
8. one of the most common factors (causes ) is that .。。
9. another contributing factor (cause ) is .。。
10. perhaps the primary factor is that
11. but the fundamental cause is that .。。
