| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have n't be seen since | 8 |
|
| 2 | [verb] n't be seen since | 8 |
|
| 3 | [vb -s] n't be seen since | 7 |
|
| 4 | has n't be seen since | 7 |
|
