| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have [been] [vb pp] [art] | 9 |
|
| 2 | may have been [vb pp] [art] | 9 |
|
| 3 | may have [been] [vb pp] a | 7 |
|
| 4 | may have [been] [vb pp] a | 5 |
|
