| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not be [vb pp] back [prep] | 30 |
|
| 2 | not be [verb] back to | 18 |
|
| 3 | not be bring back [prep] | 5 |
|
| 4 | not be brought back [prep] | 5 |
|
