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Which sentence uses the future perfect tense?

  1. She will attend training today.

  2. She is attending training today.

  3. By next week, she will have attended training.

  4. She attended training today.

The correct answer is: By next week, she will have attended training.

The correct choice is a clear example of the future perfect tense, which is used to describe an action that will be completed before a specified point in the future. In this case, "by next week" indicates that the action of attending training will be completed at some point before that time frame. The structure "will have attended" is characteristic of the future perfect, combining the auxiliary verb "will," with "have," followed by the past participle "attended." This construction is specifically designed to highlight that, at a certain future moment, the action will be finished. The other sentences do not utilize the future perfect tense. One describes an action happening in the present, while another indicates a future action that will occur without the aspect of completion by a certain deadline.