1. This is the first time (that) I have written to my lover.

 2. Her father has worked as an engineer since 1990. 

3. He has been able to drive since he was 18. 

4. Have you visited Buckingham Palace yet ? 

5. It is the most enjoyable concert (that) they have ever been at. 

6. I have never tasted such a delicious cake. 

7. It is the first time ( that ) i have ridden on a camel. 

8. Since his wife died in 1978, Charles has lived alone. 

9. Have they sent the text messages to their friends yet ? 

10. This is the best party ( that ) i have ever been to.