What is the future perfect tense? Provide examples of how it is used.

The future perfect tense is a verb tense that is used to describe an action that will be completed in the future before another action or time reference. It is formed by using the auxiliary verb "will have" followed by the past participle of the main verb.

Here are some examples of how the future perfect tense is used:

1. By the time I arrive at the party, they will have already started eating.
In this example, the action of starting to eat will be completed before the speaker arrives at the party.

2. She will have finished her project by tomorrow morning.
Here, the completion of the project is expected to happen before tomorrow morning.

3. They will have traveled to five different countries by the end of this year.
This sentence indicates that the action of traveling to five countries will be completed before the end of the year.

4. By the time he turns 30, he will have graduated from college.
The graduation from college will occur before the person reaches the age of 30.

5. I will have read three books by the time the summer vacation ends.
The reading of three books will be completed before the summer vacation comes to an end.

In all these examples, the future perfect tense is used to express an action that will be finished before a specific point in the future. It emphasizes the completion of the action before another event or time reference.