| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have not [vb pp] back | 88 |
|
| 2 | have n't [verb] back | 52 |
|
| 3 | have not come back | 42 |
|
| 4 | have not come back | 42 |
|
| 5 | have not [verb] back | 38 |
|
| 6 | had not [verb] back | 31 |
|
| 7 | have not [verb] back | 28 |
|
| 8 | has not [verb] back | 27 |
|
| 9 | have not looked back | 14 |
|
| 10 | have not look back | 14 |
|
| 11 | have not go back | 12 |
|
| 12 | have not gone back | 10 |
|
