Sure! Here’s a rewritten version of the sentences:

21. "Alright, I will pick up David from school," his father said.
22. "Please remain for a few more days," she told us.
23. "We will oppose the ban on smoking in public areas," stated the heavy smokers.
24. "I think I will see Olivia at the party," Tom said.
25. "Allow me to take the children into town," he suggested.
26. "It was kind of you to invite me to your birthday party. Thank you very much," Mike told Jane.
27. "I may have made an error in the calculations," Mr. Forest admitted.
28. "I will cover the cost," he stated.
29. "Maybe you should consider going to Paris for the weekend," Neil proposed.
30. "I couldn’t visit you last summer," Kate said.
31. Kate expressed her apologies regarding the championship. "Congratulations, Dune!" she said.
32. Dune received congratulations from everyone.