| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have been [art] [adj] | 172 |
|
| 2 | not have been [art] [adj] | 88 |
|
| 3 | may not have been [adj] | 68 |
|
| 4 | may not have been [art] | 39 |
|
| 5 | may not have [art] [adj] | 33 |
|
