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

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