The key answer of exercise 4
The key to exercise solutions in chapter 8 - Grammar in context for the textbook Gateway B1 - Workbook with authors David Spencer and Lynda Edwards from Macmillan Education
Question
Look at these important dates in history and write positive or negative sentences with the past perfect.
Answer
- By 1400 they hadn’t started to print books
- By 1805 they had made the first battery.
- By 1895 they had discovered X-rays.
- By 1900 they hadn’t flown for the first time.
- By 1910 they hadn’t discovered penicillin.
- By 1932 they had split the atom.
- By 1953 they had found the structure of DNA.
- By 1960 they hadn’t walked on the moon.
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