Cover of the textbook Outcomes Pre-Intermediate - Student's Book

The key answer of exercise 7

The key to exercise solutions in chapter 11 - Did you know ...? for the textbook Outcomes Pre-Intermediate - Student's Book with authors Hugh Dellar and Andrew Walkley from National Geographic Learning

Question

Look at the pairs of sentences and answer the questions below.

Answer

  1. Passive verbs → was discovered, is repeated, are left, be replaced, is called, was awarded Active verbs → discovered, leaves, repeat, replace, call, awarded
  2. verb be + past participle form
  3. In 1 and 3 we know because it is stated after by (1 two Russian scientists, 3 Graphene). In the other sentences we don’t know who does the action.