By next year, they _ a new house.
Correct answer: B. Will have built
- A. Will build
- B. Will have built
- C. Build
- D. Are building
Explanation
The correct answer is 'will have built' because it uses the future perfect tense, which is appropriate for actions that will be completed by a certain point in the future. The phrase 'By next year' indicates a specific future time by which the action should be completed. The other options do not convey the sense of completion by a future time: 'will build' suggests a future action without completion, 'build' is in the present tense, and 'are building' is in the present continuous tense, indicating an ongoing action.
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Tenses show when an action or state occurs and whether it is complete, continuing or repeated. The work covers present, past and future forms, including simple, continuous, perfect and perfect continuous constructions, as well as sequence of tenses and the difference between tense and aspect.
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