The key answer of exercise Grammar 2
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
Look at the timeline and the sentences in exercise 1b. Choose the correct answers in the rules below and find an example of each one.
Answer
- before - By 5000 BC, people in ancient Mesopotamia had invented the wheel ...
- 'before now' - Today ... we have landed on the moon ...
- before - within 30 years, we will have sent a manned mission to Mars ...