Sentence: "If she were to receive the job offer, she would feel immense happiness."
Explanation: This sentence uses the conditional mood because it describes a hypothetical situation dependent on a specific condition being met—in this case, her receiving the job offer. The use of "would feel" indicates that the happiness is a potential outcome that hinges on that condition. The structure "if...were to..." further emphasizes the scenario as uncertain or not currently true, which is a key characteristic of conditional constructions.