10 graders - Future perfect

This is a video about Future perfect. 

I advise you to watch, pause, rewind and watch it the amounts of times you need to. 

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 his work – maybe Thursday, maybe Friday – but definitely before Saturday.

In this website, you have tests to practice Future Perfect. You go to the page and you scroll a little bit down until you see this "More tests: English Future Perfect Tense". Here you have tests to help you out. 

Source: https://learnenglish.britishcouncil.org/en/grammar-reference/future-continuous-future-perfect