1. It is considered /thought that ------- 人們(有人,大家)認為
　　2. It is generally /usually accepted /agreed/recognized that ----普遍(一般,通常)認為
　　3. It is believed that -----有人(人們,大家)相信
　　4. It is well-known that ----大家知道(眾所周知)
　　5. It is said that ----據說(有人說)
　　6. It is learned that ---據聞(悉)
　　7. It is supposed that----據推測
　　8. It is estimated/predicted/calculated that---據估計(預計
　　9. It must be pointed that ---必須指出
　　10. It is reported that----據報道
　　11. It must be admitted that----必須承認
　　12. It will be seen that ---可見(可以看出)
　　13. It will be seen from this that ----由此可見
　　14. It is understood that----不用說(都知道)
　　15. It can not be denied that---無可否認
　　16. It has been proved/demonstrated that---已經證明
　　17. It may be confirmed that ----可以肯定
　　18. It may be safely said that----可以有把握地說
　　19. It is sometimes asked that---人們有時會問
　　20. It is expected that/hoped that----人們希望
　　21. When it comes to ------要說到,要談及