It seems like Sarah is changing her statements or opinions, and you're responding to each of them. Here’s how you could fill in your responses to Sarah based on the earlier statements:

1. **Sarah:** "Dave works very hard."
**You:** "But you said he was lazy. (He is lazy.)"

2. **Sarah:** "Let’s have fish for dinner."
**You:** "But I don't like fish. (I don't like fish.)"

3. **Sarah:** "I’m going to buy a car."
**You:** "But I can't drive. (I can't drive.)"

4. **Sarah:** "Jane is always short of money."
**You:** "But she has a very well-paid job. (She has a very well-paid job.)"

5. **Sarah:** "My sister lives in Paris."
**You:** "But I don't have any brothers or sisters. (I don't have any brothers or sisters.)"

6. **Sarah:** "I think New York is a great place."
**You:** "But I've never been to the United States. (I've never been to the United States.)"

7. **Sarah:** "Let’s go out tomorrow evening."
**You:** "But I am working tomorrow evening. (I am working tomorrow evening.)"

8. **Sarah:** "I’ve never spoken to Jane."
**You:** "But Jane is a friend of mine. (Jane is a friend of mine.)"

This way, your responses reflect your disagreement or provide additional context to what Sarah has said.