| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [adv] [prep] | 1961 |
|
| 2 | may have [been] [adv] | 293 |
|
| 3 | may have [been] [prep] | 145 |
|
| 4 | may have [adv] [prep] | 8 |
|
