| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] [art] [adj] | 609 |
|
| 2 | may have been [art] [adj] | 172 |
|
| 3 | may have been [v-ing] [art] | 18 |
|
| 4 | may have been [v-ing] [adj] | 7 |
|
