| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | we must [vb infin] back [prep] the | 9 |
|
| 2 | we must [verb] back [prep] the | 9 |
|
| 3 | we must [verb] back to the | 8 |
|
| 4 | we must [verb] back to the | 8 |
|
