1. It is considered /thought that 人们(有人,大家)认为
　　2. It is generally /usually accepted /agreed/recognized that 普遍(一般,通常)认为
　　3. It is believed that -有人(人们,大家)相信
　　4. It is well-known that 大家知道(众所周知)
　　5. It is said that 据说(有人说)
　　6. It is learned that 据闻(悉)
　　7. It is supposed that据推测
　　8. It is estimated/predicted/calculated that据估计(预计
　　9. It must be pointed that 必须指出
　　10. It is reported that据报道
　　11. It must be admitted that必须承认
　　12. It will be seen that 可见(可以看出)
　　13. It will be seen from this that 由此可见
　　14. It is understood that不用说(都知道)
　　15. It can not be denied that无可否认
　　16. It has been proved/demonstrated that已经证明
　　17. It may be confirmed that 可以肯定
　　18. It may be safely said that可以有把握地说
　　19. It is sometimes asked that人们有时会问
　　20. It is expected that/hoped that人们希望
　　21. When it comes to 要说到,要谈及