Here's how to make the positive:

• I will have finished this book.
• You will have studied the English tenses.
• She will have cooked dinner.
• He will have arrived.
• We will have met Julie.
• It will have stopped raining.
• They will have left Japan.

To make the negative, just add 'not':

• I will not have finished this book.
• You will not have studied the English tenses.
• She will not have cooked dinner.
• He will not have arrived.
• We will not have met Julie.
• It will not have stopped raining.
• They will not have left Japan.

Here are the past simple 'yes / no' questions :

• Will I have finished writing this book?
• Will you have studied all the English verb tenses?
• Will she have graduated?
• Will he have got married?
• Will it have got colder?
• Will we have met your boyfriend?
• Will they have left their jobs?

To make 'wh' questions with 'be' (the question word just goes at the beginning, everything else is the same):

• When will I have finished writing this book?
• Why will you have studied all the English verb tenses by tomorrow?
• When will she have graduated?
• Why will he have got married before June?
• Why will it have got colder by May?
• How will we have met your boyfriend by next year?
• When will they have left their jobs?

Usage:

1. To express an action that will be completed before some stated time in future.
   • I will have taken tea by 7 o’clock.
2. To show time expressions: by then, until.
   • They will not have finished their work until then.