Ex. 14 Compare the translation of Gerund Indefinite and Perfect and define the function.

1. Heating the gas increases the speed of the molecules.	Their having overheated the gas changed the results of the experiment.
2. The investigator mentioned his testing this material for strength.	The investigator mentioned his having tested this material for strength.
3. Without improving the properties of this alloy we can’t use it in the production process.	Without having improved the properties of this alloy we couldn’t use it in the production process.