Ex.3 .Find Infinitive in the following sentences and translate the sentences which contain it into Ukrainian:
1. To be useful as an ore, an iron mineral must contain at least 30 to 40% of iron. 2. Atoms are too small to be seen under a powerful microscope. 3. In his youth Faraday had to save money to buy the apparatus necessary for his experiments. 4. Some scientists are known to have attacked Franklin’s point of view on the electric nature of lightning.
5. Lightning is known to have frequently destroyed wooden buildings before the lightning rod was invented. 6. Come to the laboratory today. 7. We know that when two elements which have the same valence unite to form a compound, they will combine atom for atom. 8. Those gases were condensed to a liquid.

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