Use the "going to" future to talk about things you've already decided to do or things that you can see are going to happen. Use the "will" future to talk about things you've just decided to do, when you make predictions or when you offer, promise or agree to do something. Use the Future Continuous to say what will be happening at some point in the future or when an interrupting action occurs in the future. Use the Present Continuous to describe plans and arrangements you've made for the future. Use the Simple Present to describe schedules and timetables.

Good question Nhi Vo. There are actually three ways to form the future tense in English. Will+ do We use this for predictions or spontaneous descions. "He will be a handsome man when he grows up" "It has started raining, I will close the window" Going to+ do Planned action in the future "Tomorrow I am going to visit my friend" Be + doing We use this for scheduled future events "I am flying to Brazil on 28 December"

Let's look at these sentences: 1. I am going to do some chores. 2. I will be doing some chores. 3. I am doing chores. #1 is future but less certain than #2. It more like a declaration of intent. #1 emphasizes your preparation to do chores whereas #2 emphasizes the stated goal: doing chores. #2 is future, and certain. #3 is the least specific of the three. Unless you add an extra word like "now" or "tomorrow", it has no time frame. It can be present, or future, or timeless: I am doing chores right now. (present) Tomorrow I am doing chores. (future) To make life easier for my wife, I am doing chores. (timeless) Certainty depends as much on how you say the sentence as it does on the words you use. For example, if you emphasize "am" or "going" (or both) in #1, you can express a high degree of certainty: I AM going to do some chores. I am GOING to do some chores. On the other hand, if you say #2 without conviction, you can sound uncertain.