3.
1) I watched...
2) I done...
3) This class started...
4) I got up...
5) We studied...
6) I had...
4.
1) I didn't watch...
2) I didn't do...
3) This class didn't start...
4) I didn't get up...
5) We didn't study...
6) I didn't have...
5.
1) When did you begin...
2) When did you start...
3) When did go...
4) When did you celebrate...
5) When did you watch...