Here are the sentences rewritten with equivalent meaning as requested:

1. The workers are going to redecorate our house.
→ We **are having our house redecorated.**

2. Peter was so happy that he didn't know what to say. (LOSS)
→ Such **was Peter's happiness that he didn't know what to say.**

3. Peter was so happy that he didn't know what to say. (SUCH)
→ Peter's happiness **was such that he didn't know what to say.**

4. Jack didn't reduce his smoking breakfast, so he's ill now. (CUT)
→ Had **Jack cut down on smoking, he wouldn't be ill now.**

5. Because of his mom's anger, he was forced to stop using his mobile phone. (MADE)
→ So **angry was his mom that he was made to stop using his mobile phone.**

6. There are hopes that the patient will become conscious again. (COME)
→ It **is hoped that the patient will come to consciousness again.**

7. Jack's laziness prevents him from entering that competition last month. (GONE)
→ Were **Jack not so lazy, he would have entered that competition last month.**

8. Jack's laziness prevents him from entering that competition last month. (GONE)
→ Were it **not for Jack's laziness, he would have entered that competition last month.**

9. I am not courageous enough to describe the robber to the police. (DESCRIPTION)
→ I don't have **the courage to give a description of the robber to the police.**

10. You should impress your new teacher. (IMPRESSION)
→ Were **you to impress your new teacher.**

11. Jack was so impressed by Hanoi that he decided to move to live there. (SETTLE)
→ So **impressed was Jack by Hanoi that he decided to settle there.**

12. Mary persuaded me to talk more about my plan. (GO)
→ Mary got **me to go into more detail about my plan.**

13. He spoke so persuasively that I was deceived by his lies. (FELL)
→ He was so **persuasive that I fell for his lies.**

14. My mom said that I could not punish my son. (LET)
→ My mom made **it clear that I could not punish my son.**

15. My mom said that I could find the meaning of the new words in the dictionary. (LOOK)
→ My mom let **me look up the meaning of the new words in the dictionary.**

16. There are announcements that the flights will be delayed until midnight. (PUT)
→ The flights **have been put on delay until midnight.**

17. It was so noisy that I couldn't sleep at all.
→ Had it **not been so noisy, I could have slept.**

18. There were so many people that I couldn't see Tom. (MAKE)
→ There were such **a number of people that I couldn't see Tom.**

19. According to weather forecasts, we will have storms next week. (SET)
→ It is **forecast that storms are set to occur next week.**

20. Jack was so surprised that he fell down. (TAKEN)
→ Had **Jack not been taken by surprise, he wouldn't have fallen down.**

Feel free to ask if you need more transformations or additional assistance!