| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] have been responsible for | 39 |
|
| 2 | [modal v] have been responsible for | 39 |
|
| 3 | [modal v] have been responsible for | 39 |
|
| 4 | [vb mod] have been responsible for | 39 |
|
| 5 | may have been responsible for | 20 |
|
| 6 | may have been responsible for | 20 |
|
| 7 | could have been responsible for | 6 |
|
| 8 | could have been responsible for | 6 |
|
| 9 | must have been responsible for | 5 |
|
| 10 | must have been responsible for | 5 |
|
| 11 | might have been responsible for | 5 |
|
| 12 | might have been responsible for | 5 |
|
