| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [adv] [verb] been responsible [prep] | 6 |
|
| 2 | may [adv] [vb infin] been responsible [prep] | 6 |
|
| 3 | may [adv] [verb] been responsible for | 6 |
|
| 4 | may [adv] have been responsible [prep] | 6 |
|
| 5 | may [adv] have been responsible [prep] | 6 |
|
