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Form: future perfect

 AffirmativeA declarative sentence indicating "yes"; also called a positive sentence. E.g.: John likes squash a lot.

subject auxiliary verb (perfect infinitive)  
I
You
He/she/it
We
You
They		 will have finished by then.

NegativeA declarative sentence indicating "no". E.g.: Tim has no friends.

subject auxiliary not verb (perfect infinitive)  
I
You
He/she/it
We
You
They		 will not have finished by then.

InterrogativeThe sentence type used to express a direct question. E.g.: What are you doing?

(question word) auxiliary subject verb (perfect infinitive)  
(By what time) will I
you
he/she/it
we
you
they		 have finished ?
Future perfect
Future perfect Future perfect for actions completed before a point in the future
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