1. Unless you are careful, you will cut yourself with that knife (If1: If + S + do/does + not + V(inf), S + will/modal verbs + V(inf) = Unless + S + V(s,es), S + will/modal verbs + V(inf) 

2. Unless I like this one, I'll bring you another 

3. Unless I have a quiet room, I'll not be able to do any work (câu này mệnh đề if nằm sau nên ta chỉ cần đảo ra trước và chuyển theo cấu trúc như câu 1)

4. Unless she hurries, she'll be late 

5. Unless we had more rain, our crops would not be better (If2: If + S + did not + V(inf), S + would/could/should/might + V(inf) = Unless + S + V_ed/2, S + would/could/should/might + V(inf); If we had more rain, our crops would be better = If we didn't have more rain, our crops would not be better = Unless we had more rain, our crops would not be better)

6. Unless she did her hair differently, she would not look quite like 

7. Unless I won a big prize in a lottery, I'd not give up my job