Answer — Exercise 5
7.5 - Grammar·Focus 4 (2nd edition) - Student's Book
Question
Rewrite each sentence in two ways. Begin with the words in brackets.
Answer
- 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 seventeenth century is considered to have been a high point in the history of mathematics. / It is considered that the seventeenth century was a high point in the history of mathematics.
- It was thought that calculators could harm students’ Maths skills. / Calculators were thought to be able 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.