Read the grammar explanation and do the exercise.

The future continuous (will be + ‘ing’ form) and the future perfect (will have + past participle) tenses are used to talk about events in the future.

Future continuous

  • Don’t ring at 8 o’clock. I’ll be watching Who Wants to be a Millionaire.
  • This time tomorrow we’ll be sitting on the beach. I can’t wait!

We use the future continuous to talk about something that will be in progress at or around a time in the future.

  • Don’t phone grandma now, she’ll be having dinner.
  • The kids are very quiet. They’ll be doing something wrong, I know it!

These sentences are not about the future but we can use the future continuous to talk about what we assume is happening at the moment.

Future Perfect

  • Do you think you will have finished it by next Thursday?
  • In 5 years time I’ll have finished university and I’ll be able to earn some money at last.

We use the future perfect to say that something will be finished by a particular time in the future.

We often use the future perfect with ‘by’ or ‘in

  • I think astronauts will have landed on Mars by the year 2020.
  • I’ll have finished in an hour and then you can use the computer.

By’ means ‘not later than a particular time’ and ‘in’ means 'within a period of time’. We don’t know exactly when something will finish.

  • I promise I’ll have done all the work by next Saturday.

We don’t know exactly when he will finish the work – maybe Thursday, maybe Friday – but definitely before Saturday. 

Exercise

Language level

Upper intermediate: B2

Comments

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This site seems to be very helpful. I really appreciate. Thanks to you all for your support

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Hi teacher , any recommendation to improve my grammar and writing ? I stopped at simple present , simple past and continuous tense..certain grammar I'm quite confused . for example , why u say/said that ? Especial how to ask questions. Please advice thanks

Hi tclian,

There's some advice on our Help page that might be useful for you, and I'd also suggest you try one of the sections in Listen & Watch. For example, when you work through the Elementary Podcasts, you work on your listening comprehension, grammar and vocabulary all at once, and most people find it more interesting that working through grammar pages alone.

I'm afraid I don't understand your question about 'say/said' - could you please rephrase it?

Best regards,
Kirk
The LearnEnglish Team

Sir, Please tell me the difference between

1.I promise I’ll have done all the work by next Saturday.
And
2.I promise I’ll do all the work by next Saturday.

Thank you sir.

Hello deepuips,

In this context there is no difference in meaning. The 'will have' form, sometimes called 'future perfect', tells us that an action will be completed before a certain time. The 'will' form tells us than an action will take place in the future, but not necessarily that it will be completed.

I will eat dinner by three o'clock. - I will start before three but may not finish until after three.

I will have eaten dinner by three o'clock. - My dinner will be finished before three.

In your context 'do the work' already means 'complete the work', so there is no difference in meaning.

I hope that clarifies it for you.

Best wishes,

Peter

The LearnEnglish Team

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