Every sentence, clause, and phrase should begin with a no-emphasis lead-in. The energy at the beginning is low; at the end it is high. The phrase, clause, or sentence should end with a strong declarative emphasis. This also applies to every time there is a phrasing break in the sentence interior. Remember, this refers to emotional energy, not volume. Everything builds, from the shortest phrases to clauses to lists.
Most importantly, don’t move outside the emotional energy and pitch parameters you have set for yourself for delivering a particular script.