| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [vb pp] [prep] [det] | 2779 |
|
| 2 | may have [been] [vb pp] [prep] | 550 |
|
| 3 | may have [vb pp] [prep] [det] | 51 |
|
| 4 | may have [been] [prep] [det] | 13 |
|
| 5 | may have [been] [vb pp] [det] | 5 |
|
