Englishknowledge1a. had opened 1b. Did Mr Hue open 2a. didn't take 2b. had taken 3a. had finished 3b. finished 4a. were wearing 4b. had been wearing 5a. had done 5b. was he doing 6a. had written 6b. wrote 7a. had changed 7b. did your son change 8a. had talked 8b. talked 9a. Had all the students returned 9b. returned 10a. had seen 10b. didn't see
1b. Did Mr Hue open
2a. didn't take
2b. had taken
3a. had finished
3b. finished
4a. were wearing
4b. had been wearing
5a. had done
5b. was he doing
6a. had written
6b. wrote
7a. had changed
7b. did your son change
8a. had talked
8b. talked
9a. Had all the students returned
9b. returned
10a. had seen
10b. didn't see