11. She is excited to get first prize in the competition.

12. My mother was very surprised to hear that I had won a lottery.

13. I was very happy to meet my long-lost friend again.

14 She is determined to find the best solution for this serious problem.

15. It is kind for her to help the poor and the disabled.

16. It is clever for him to choose to work in Nancy's team.

17. He is difficult to understand.

18. Is it safe for this water to drink?

19. Mary is silly to give up her job when she needs the money.

20. It is impossible for some words to be translated.

@PinkHanh

Ct : S + tobe + Adj + ( for O ) + to Vo

    It  + tobe + Adj + ( for O ) + to Vo

11. She is excition that she gets first prize in the competition. 
12. My mother was very surprising when she heard that I had won a lottery.
13. I was very happy that I met my long-lost friend again.
=> Very happy I was that I meted my long-lost friend again.
14. She is determined that she can find the best solution for this serious problem. 
=> Determined she was that she can find the best solution for this serious problem. 
15. Mary is kind because she helps the poor and the disabled. => => It is kind because she helps the poor and the disabled.
16. Peter is clever when he chooses to work in Nancy's team. => => It is clever when he chooses to work in Nancy's team.
17. It is difficult to understand him. => He is difficult to understand.
18. Do you think this water is safe to drink? ( it)
19. It's silly of Mary to give up her job when she needs the money. => Mary is silly of to give up her job when she needs the money. 
20. Some words cant possibly be translated. => It's can't possibly be translated