Apply to the event, or action that is not in the future. As that forecast now and then one event or action will occur, there is complete, then the other 2 events occurred.
Use the event Or acts that would happen simultaneously in the future. It is just the expectation that if by then the event. Or acts will not happen completely, then there are two events that followed.
Use the event. Or the actions to occur at different times in the future. The estimated that only if at that time and events. Or action one will happen completely before have another event that 2 occurs.