write each of the two sentences below as one sentence. use the Third Conditional with "had" (or "hadn't")+ "wouldn't have"​

The steam was invented for James Watt, who worked is many years before he could make the instruments by which he perfekted his machine at first he worked in primitive tools so he could not make his engin well-regulated.
the old machine was kept going for a boy who stood by it and let in the air with means of which the steam was coldensed at every revolytion in this machine, tho ugh it was imperfect, some work was done and it had been used for a large mine-owner (шахтовладелец) to pump out the water. The first efficient steam-engine was madefor a Birmingham firm and it was soon used nearly every monufacturer. The revolution in industru made in this machine was extremely great.

1. Quite a large number of definitions have been given to statistics as a science.

2. The war brought major changes in the programme of statistical work and the methods of observation and processing.

3. All progressive knowledge in the modern world tends to precision.

4. At present many countries have declared themselves republics, some of them have become independent and encourage the use of local languages.

5. They had been working there for more than three hours when it happened.

6. Nowadays some difficult economic problems are solved on the basis of statistical data.

7. A theory is known to be tested by practice.