| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [vb pp] back [prep] | 31 |
|
| 2 | not come back [prep] | 11 |
|
| 3 | not [vb pp] back to | 10 |
|
| 4 | not [vb pp] back for | 5 |
|
| 5 | not expected back [prep] | 5 |
|
| 6 | not [vb pp] back from | 5 |
|
