| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [adv] have been responsible for | 9 |
|
| 2 | [vb mod] [adv] have been responsible for | 9 |
|
| 3 | may [adv] have been responsible for | 7 |
|
| 4 | may [adv] have been responsible for | 7 |
|
| 5 | [adv] have been responsible for [art] | 7 |
|
| 6 | [adv] have been responsible for [art] | 7 |
|
