1. a) she didn't see your brother, b) did she see your brother?
2. a) we didn't hear a terrible noise, b) did we hear a terrible noise?
3. a) he didn't sleep till 10.00, b) did he sleep till 10.00.?
4. a) he didn't look at the picture, b) did he look at the picture?
5. a) they didn't drink all the wine, b) did they drink all the wine?
6. a) they didn't set up early enough, b) did they set up early enough?
7. a) she didn't think about it, b) did she think about it?
8. a)the police didn't catch the thief, b) did the police catch the thief?
9. a) he didn't hide the letter, b) did he hide the letter?
10. a) she didn't find her watch, b) did she find her watch?
11. a) his nose didn't bleed, b) did his nose bleed?