Sure! Here’s a rewritten version of each sentence with the same meaning:

1. There is no better time to visit Paris than in the spring.
-> Spring is the best time to visit Paris.

2. There is no more convenient way to get there than by taking the subway.
-> Taking the subway is the most convenient way to get there.

3. Her bag is larger than my bag.
-> My bag is smaller than hers.

4. The new laptop is faster than the old laptop.
-> The old laptop is slower than the new laptop.

5. His phone is more expensive than her phone.
-> Her phone is less expensive than his.

6. This book is more interesting than that book.
-> That book is less interesting than this one.

7. The blue dress is prettier than the pink dress.
-> The pink dress is not as pretty as the blue one.

8. No other city is as crowded as Tokyo.
-> Tokyo is the most crowded city.

9. He doesn’t play the piano as skillfully as his teacher.
-> His teacher plays the piano more skillfully than he does.

10. This phone doesn’t have as many features as the other one.
-> The other phone has more features than this one.

11. The small suitcase isn’t as heavy as the big suitcase.
-> The big suitcase is heavier than the small one.

12. No one in the class speaks as many languages as Lisa.
-> Lisa speaks more languages than anyone in the class.

13. This is the most beautiful painting in the gallery.
-> No other painting in the gallery is more beautiful than this one.

14. He is the best student in the class.
-> No one in the class is better than he is.

15. No one in the class is.
-> Everyone in the class is present.

16. No country in the world has a larger population than China.
-> China has the largest population in the world.

17. The red dress is the most expensive dress in the store.
-> No other dress in the store is as expensive as the red dress.

18. Her old house is bigger than her new one.
-> Her new house is smaller than her old one.

19. No one in my class is taller than Peter.
-> Peter is the tallest in my class.

20. The black dress is more expensive than the white one.
-> The white dress is less expensive than the black dress.

If you need further assistance, feel free to ask!