가정법 문제 답이 맞는지 봐주세요

제가 적은 답이 맞는지, 다른 답도 가능한지 궁금합니다.

If they had realized the danger, they would have done it differently.
→ Had they realized the danger, they would have done it differently.

서두르면 버스를 탈 수 있을 거야.
If you hurry up, you would catch the bus. → will / can

If I were smart, I could solve it out.
→ Were I smart, I could solve it.