Use the comments are said to occur in the future. This means that at a time in the future. I'm doing something for a long time is that more than one will be able to speak one at a time. In the example, see nikho 2: there is a single event, and the event happened just about the same time.
Used to refer to events that are happening in the future means that at a certain period in the future. I am doing something, I will not say more than a long one. In this example, see 2 is a single event. The two events occur simultaneously.
.Used to refer to that is going to happen in the future, meaning that at any given time in the future, I'm doing something, which for a long time. So long to say one. In here for example to see 2, is a single event.