We use it to talk about activities that will be finished by a certain time in the future. We often use the preposition by. It means 'some time before'. - She will have had lunch by 3 pm. (Future Perfect), We use it to talk about future arrangements or plans that have been confirmed. - Tomorrow I'm eating out. My parents booked last week. (Present Continuous), We use it to talk about activities in progress at a particular time in the future. The activities are in progress and so they are unfinished. - We won't be having dinner at 6 pm tomorrow. (Future Continuous), We use it for plans and intentions which we have already decided to do in the future. - We've decided that we're going to eat out. (To be going to), We use it to talk about the future when it is an objective truth. - It's my birthday next week. I'll be seventeen. (Future Simple), We can also use it to talk about the future when the action is part of a timetable or routine. - My class starts at 8 am tomorrow. (Present Simple), We use it directly after time expressions like when, as soon as, until, after and before. We cannot use it with these time expressions. - When I go to the shops, I'll buy something to eat. (Present Simple), We can also use it to make predictions about the future, particularly when we have evidence for the prediction. - I've studied hard for this exam. I think I'm going to pass. (To be going to), We use it to make general predictions about the future. We often use think, hope, expect, etc. to express our opinion. - I think our next exam will be easy. (Future Simple), We also use it when we decide to do something at the moment of speaking. - You look tired, Dad. I'll make the dinner tonight. (Future Simple),

Grammar reference 4

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