7 - Grammar - Passive reporting structures
Exercise
5
Rewrite each sentence in two ways. Begin with the words in brackets.
Solution
- It is known that most mathematical symbols were invented in the 1500s. / Most mathematical symbols are known to have been invented in the 1500s.
- The 17th century is considered to be a high point in the history of mathematics. / It is considered that the 17th century was a high point in the history of mathematics.
- It was thought by many teachers that calculators could harm students' Maths skills. / Calculators were thought by many teachers to harm students' Maths skills.
- There are estimated to be over 10,000 new Maths graduates every year in the UK. / It is estimated that there are over 10,000 new Maths graduates every year in the UK.