| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [vb mod] [verb] back [art] | 5 |
|
| 2 | [noun prp] [modal v] [vb infin] back [art] | 5 |
|
| 3 | [noun prp] [modal v] [verb] back the | 5 |
|
