| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may [adv] have been | 768 |
|
| 2 | [modal v] only have been | 120 |
|
| 3 | may only have be | 5 |
|
| 4 | may only have been | 5 |
|
| 5 | may only [vb infin] been | 5 |
|
| 6 | may only have [be] | 5 |
|
| 7 | may only [verb] been | 5 |
|
| 8 | may only have [been] | 5 |
|
