| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [not/n't] have been [prep] | 105 |
|
| 2 | [modal v] have been [prep] [det] | 105 |
|
| 3 | [modal v] [not/n't] have been [det] | 80 |
|
| 4 | [not/n't] have been [prep] [det] | 19 |
|
