| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] not have been [det] | 80 |
|
| 2 | [vb mod] not have been [v-ing] | 72 |
|
| 3 | [vb mod] have been [v-ing] [det] | 35 |
|
| 4 | not have been [v-ing] [det] | 9 |
|
