The key answer of exercise Practice 1
The key to exercise solutions in chapter 06 - Language focus 1 for the textbook Cutting Edge Upper-Intermediate - Student's Book with authors Sarah Cunningham, Peter Moor and Jonathan Bygrave from Pearson Education
Question
Complete the sentences below with the correct form of the verbs in brackets (positive or negative). Use the timeline to help you.
Answer
- had invented; hadn’t learnt
- had been invented; hadn’t yet made
- have discovered; haven’t found
- will probably have found; won't have discovered
- probably won’t have learnt; will probably have learnt