| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [verb] been responsible for | 23 |
|
| 2 | who have been responsible for | 23 |
|
| 3 | who [verb] been responsible for | 23 |
|
| 4 | who [verb] been responsible for | 23 |
|
| 5 | who had been responsible for | 16 |
|
| 6 | who [vb past] been responsible for | 16 |
|
