| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] not have been [v-ing] [prep] | 10 |
|
| 2 | [modal v] not have been [v-ing] [prep] | 10 |
|
| 3 | not have been [v-ing] [prep] [art] | 5 |
|
| 4 | not have been [v-ing] [prep] [art] | 5 |
|
