Answer:
1. She has written a letter. (Future Perfect Tense)
Ans. She<u><em> will have written</em></u> a letter.
2. Her uncle drives a car. (Past Continuous Tense)
Ans. Her uncle <u><em>was driving</em></u> a car
3. She will buy a new dress. (Simple Present Tense)
Ans. she<u><em> buy</em></u> a new dress
4. He has typed a letter. (Present Continuous Tense)
Ans. He <u><em>is typing</em></u> a letter
5. They were doing homework. (Past Perfect Continuous Tense)
Ans. They <u><em>had been doing</em></u> homework
6. We have made a plan. (Simple Future Tense)
Ans. We <u><em>will make</em></u> a plan
7. She had been watching television. (Future Continuous Tense)
Ans. She <u><em>will be watching</em></u> television
8. He had broken the vase. (Present Perfect Tense)
Ans. He <u><em>has broken</em></u> the vase.
9. They go to the cinema. (Future Perfect Continuous Tense)
Ans. They<u><em> will have been going </em></u>to the cinema.
10. John And Sarah will talk to each other. (Simple Past Tense)
Ans. John And Sarah <u><em>talked</em></u> to each other.
11. The cat ate all the chicken. (Present Perfect Continuous Tense)
Ans. The cat <u><em>has been eating</em></u> all the chicken
12. The car stops at the traffic light. (Past Perfect Tense)
Ans. The car <u><em>had stopped</em></u> at the traffic light.