| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have been [prep] | 145 |
|
| 2 | have been [noun sg] [prep] | 114 |
|
| 3 | may have [noun sg] [prep] | 76 |
|
| 4 | may have been [noun sg] | 41 |
|
