We use the future perfect continuous to describe a continuous action that is already in progress at a point in the future.
We often use it with "for" to state the amount of time between when the action started and a point in its progress in the future or the point when we expect the action to finish.
We can also use it to describe a continuous action that we believe or predict is currently in progress.
- "At the end of December, James will have been working at the company for a year."
- "By the time my sister arrives at the airport, I will have been waiting for over three hours."
- "Sarah won't have been reading her emails because she’s on holiday."
Complete the sentences to form the future perfect continuous with the correct answer from a, b, c or d:
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