| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] not have been [prep] | 105 |
|
| 2 | [modal v] not have been [prep] | 105 |
|
| 3 | may [adv] have been [prep] | 48 |
|
| 4 | may not have [been] [prep] | 15 |
|
| 5 | may not [verb] been [prep] | 15 |
|
| 6 | may not have [be] [prep] | 15 |
|
| 7 | may not have be [prep] | 15 |
|
| 8 | may not have been [prep] | 15 |
|
