| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have been a [noun] | 113 |
|
| 2 | [det] have been a [noun] | 82 |
|
| 3 | [det] may have been a | 22 |
|
| 4 | [det] may have been [noun] | 10 |
|
