The key to exercise solutions in chapter 7.5 - Grammar for the textbook Focus 4 - Student's Book with authors Kay Sue, Jones Vaughan, Brayshaw Daniel and Beata Trapnell from Pearson Education

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.
- 3 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.