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I believe the answer is: <span>written as a fragment rather than a full infinitive phrase.
The purpose of a speech should generally targeted to all audiences of the speech. 'Improving personal relationships' is something that could only be done to a handful of people and could only be done by communicating with those people directly, not by speaking to the crowd.</span>
<span>The law of conservation of energy states that energy can change from one form into another, but it cannot be created or destroyed. Or the general definition is: The totalenergy of an isolated system remains constant over time. ... A device that demonstrates the Law of Conservation of Mechanical Energy and Momentum.</span>
They were put to work in harsh conditions in the fields.
