26. If you cook dinner, I the dishes.
27. If I have a party, I will invite all my friends.
28. If it is sunny tomorrow, we go to the park.
29. Whenever it rains, I take an umbrella.
30. If you do not sleep, you get tired.
Ответ: 26. cook; 27. will invite; 28. is; 29. rains; 30. do not sleep