| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have not [vb pp] back | 88 |
|
| 2 | [verb] n't [vb pp] back | 54 |
|
| 3 | [verb] not come back | 45 |
|
| 4 | [verb] not [vb pp] back | 37 |
|
| 5 | [vb past] not [vb pp] back | 32 |
|
| 6 | [vb base] not [vb pp] back | 31 |
|
| 7 | had not [vb pp] back | 31 |
|
| 8 | [vb -s] not [vb pp] back | 28 |
|
| 9 | have not [vb pp] back | 28 |
|
| 10 | has not [vb pp] back | 27 |
|
| 11 | [verb] not looked back | 14 |
|
| 12 | [verb] not gone back | 10 |
|
