17. A number of factors could account for the development in…

　　18. Perhaps the primary reason is…

　　19. It is chiefly responsible of…

　　20. the reasons for…are complicated, And probably they are found in the fact…

　　21. Here are several possible reasons, excerpt that…

　　22. Somebody believes/argues/holds/insists/thinks that…

　　23. It is not simple to give the reason for this complicated phenomenon…

　　24. Different people observes it in different ways.

　　四、用于文章的开头沪江四六级

　　1. As the proverb says…

　　2. It goes without saying tan…沪江四六级

　　3. Generally speaking…

　　4. It is quite clear than because…

　　5. It is often said that …

　　6. Many people often ask such question:“…？”

　　7. More and more people have come to realize…

　　8. there is no doubt that…

　　9. Some people believe that…

　　10. these days we are often told that, but is this really the case?

　　11. One GREat man said that…

　　12. Recently the issue of… has been brought to public attention.

　　13. In the past several years there has been…

　　14. Now it is commonly held that… but I doubt whether…

　　15. Currently there is a widespread concern that…沪江四六级

　　16. Now people in growing number are coming to realize that…

　　17. there is a general discussion today about the issue of …

　　18. Faced with…, quite a few people argue that…, but other people conceive differently.

　　五、用于文章的结尾

　　1. from this point of view…

　　2. in a word…

　　3. in conclusion…

　　4. on account of this we can find that…

　　5. the result is dependent on…

　　6. therefore, these findings reveal the following information:

　　7. thus, this is the reason why we must…

　　8. to sum up …

　　9. as far as…be concerned, I believe that…沪江四六级

　　10. It is obvious that…

　　11. there is little doubt that…

　　12. there is no immediate solution to the problem of …, but …might be helpful

　　13. None of the solutions is quite satisfactory. The problem should be examined in a new way.

　　14. It is high time that we put considerable emphasis on…

　　15. Taking into account all these factors, we may safely reach the conclustion that…

　　六、用于论证和说明

　　1. As it is described that…

　　2. It has been illustrated that…

　　3. It provides a good example of…

　　4. We may cite another instance of…

　　5. History man provides us with the examples of…

　　6. A number of further facts may be added…沪江四六级

　　7. the situation is not unique, it is typical of dozens I have heard.

　　8. A recent investigation indicate that…

　　9. According to the statistics provided …

　　10. According to a latest study, it can be predicted…

　　11. there is no sufficient evidence to show that…