| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [adv] have been | 768 |
|
| 2 | [adv] have been [noun] | 156 |
|
| 3 | may have been [noun] | 110 |
|
| 4 | may [adv] have [noun] | 108 |
|
