Why would one use conditional sentences?

Using conditional sentences is essential for expressing hypothetical situations or outcomes. These structures allow speakers to discuss scenarios that may not be real or that could happen under specific conditions. For instance, phrases like "If I had a million dollars, I would travel the world" illustrate a situation that relies on an unreal condition. This form of expression helps communicate possibilities, dreams, or consequences that depend on certain factors, making conditional sentences crucial for discussing what could happen, what might have happened, or what would happen under various circumstances.

In contrast, other options focus on certainty, invitations, or definite facts, which do not align with the purpose of conditional sentences. They specifically cater to discussions involving uncertainty or speculation rather than fixed reality or direct invitations.