Spontaneous action
I will help you. - Future Simple
Plan
I am going to have party.
I am having a party on Friday. - Be going to or Present Continuous
To make an offer
We will send you an email.
Look out! The tree ................. (fall)!
Look out! The tree is going to fall!
I ........ (might / stay) at home tonight or I ....... (might / go) to the cinema.
I might stay at home tonight or I might go to the cinema.
Future action is fixed, it's a timetable
The film starts at 8.00 pm tomorrow. - Present Simple
Predictions based on evidence
He is going to fall. I see a big hole in front of him. - Be going to
To mean want to or be willing to
I hope you will come to my birthday party.
According to this timetable, the train .......... (arrive) at 12.00.
According to this timetable, the train arrives at 12.00.
I'll come home when ................ (finish) work.
I'll come home when I finish work.
Arrangement
I am playing football with my friends on Saturday. - Present Continuous.
Promise
I will send you my work today. - Future Simple
Express beliefs about the future
It will be a nice day tomorrow.
Great news! Jean and Chris ..... (come) to stay with us.
Great news! Jean and Chris are coming to stay with us.
I .......................... (fly) to New York at that time tomorrow.
I will be flying to New York at that time tomorrow.
Prediction about the far future
New York will become a beautiful city in 100 years time. - Future Simple
Intention
He is going to travel a lot this year. - Be going to
This tense refers to a completed action in the future
By the time we get there, the film will have started. - Future Perfect
If we don't get there by 6.00, Jack ................. (leave)
If we don't get there by 6.00, Jack will have left.
We ......................... ( take) all the exams by the end of this week.
We will have taken all the exams by the end of this week.
Something happening before and after a specific time in the future
I will be watching a football match at 7 tomorrow. Can you call me later? - Future Continuous
Instead of the present continuous or be going to when we are talking about plans, arrangements and intentions
They will be coming to see us next week. - Future Continuous
This form is used to project ourselves forward in time and to look back
I will have been waiting here for two hours by ten o'clock. - Future Perfect Continuous
As soon as we ...............(get) there, we................ (phone) for a taxi.
As soon as we get there, we will phone for a taxi.
When I come at 6:00, ............... (practice) long?
When I come at 6.00, will you have been practicing long?