| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [verb] [det] | 1496 |
|
| 2 | may have [been] [verb] | 1112 |
|
| 3 | may have [verb] [det] | 305 |
|
| 4 | may have [been] [det] | 49 |
|
