Future Perfect Simple 

I, you, he/she/it, we, they + Will + have + participle 

I will have finished + future time expression 

She will not have finished + future time expression 

Will you have finished + future time expression?

What are the SIGNAL WORDS that go with this tense? 

By …, when, before etc

Do we use the future perfect simple for completed actions before a certain time?

Will you have finished your homework before our next class?

What important things will you have done by your next birthday?

Do we use the future perfect simple for continuing states and situations up to a certain time?

How long will you have had a computer by the end of this year?

How long will you have belonged to a gym/group by the end of this month?