| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] n't [vb pp] back | 19 |
|
| 2 | has n't [vb pp] back | 19 |
|
| 3 | [vb -s] n't come back | 8 |
|
| 4 | [vb -s] n't looked back | 6 |
|
