| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have n't [vb pp] back | 52 |
|
| 2 | have not come back | 42 |
|
| 3 | have not [vb pp] back | 36 |
|
| 4 | had not [vb pp] back | 31 |
|
| 5 | have not [vb pp] back | 28 |
|
| 6 | has not [vb pp] back | 27 |
|
| 7 | have not looked back | 14 |
|
| 8 | have not gone back | 10 |
|
