1 write
2 are ... writing
3 wrote
4 has written
5 wrote
6 will ... write
7 was writing
8 Will ... write
9 am not writing ... write
10 Is ... writing
11 were shere writing
12 writes
1 were returned
2 are exhibited
3 is taken, will be operated
4 is used
5 are carried out, were not carried out