| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back on and [verb] | 16 |
|
| 2 | back on and [verb] | 16 |
|
| 3 | back on [coord] [verb] | 16 |
|
| 4 | back on [conj] [vb past] | 9 |
|
| 5 | back on [conj] [vb base] | 6 |
|
