| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] [vb pp] to | 1344 |
|
| 2 | [modal v] [verb] back to | 887 |
|
| 3 | [verb] [vb pp] back to | 310 |
|
| 4 | [modal v] [verb] [vb pp] back | 113 |
|
