the to be verb allows you to use present particle (verb ending in -ing) You can say, "I will come at 3pm" You could also say "I will be coming at 3pm" but would be fine if you added, "I will be coming at 3pm after I finish my homework" Here is a website to help you use these tenses http://www.englishpage.com/verbpage/futurecontinuous.html Hope this helps!

This lies in the difference English makes between present and present continuous. I come - I do this regularly, or generally ."I come to school at 8am every day." I am coming - I am doing this right now, as we speak. "What are you doing? I am coming to school". Therefore, we can extend the same logic to the future tense: I will come - I will come generally, with no emphasis on the journey. "I will come to the party at 9." I will be coming - An emphasis on the journey, or something disrupting that journey. "What will you be doing at 8.45?" "I will be coming to the party". Both are acceptable, especially in the future tense.