| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] [prep] [pron] | 73 |
|
| 2 | may have been [v-ing] [prep] | 40 |
|
| 3 | may have been [prep] [pron] | 9 |
|
| 4 | may have been [v-ing] [pron] | 8 |
|
