| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [been] [vb pp] | 3689 |
|
| 2 | [been] [vb pp] a | 1298 |
|
| 3 | not [vb pp] a | 769 |
|
| 4 | not [been] a | 193 |
|
