Cover of the textbook New Total English Advanced - Students' Book

The key answer of exercise 5

The key to exercise solutions in chapter 7.1 - Animal instinct for the textbook New Total English Advanced - Students' Book with authors JJ Wilson with Antonia Clare from Pearson Education

Question

Do sentences a and b in each pair below have the same meaning? If not, how are they different? Which are wrong?

Answer

  1. different → a means only those monkeys whose DNA is similar to humans are used in research (other monkeys are not used because their DNA is not similar to humans'); b means that all monkeys may be used because all monkeys have similar DNA to humans.
  2. b is wrong because it needs to be a defining relative clause, therefore without the comma.
  3. b is wrong because there should be a comma after seals. It must be a non-defining relative clause (because all seals' blubber is used for fuel and food).
  4. Both are correct.
  5. b is wrong. You can't use that to begin a non-defining relative clause.