| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] [verb] back [prep] | 1643 |
|
| 2 | when [noun prp] [verb] [prep] | 879 |
|
| 3 | when [noun prp] [verb] back | 114 |
|
| 4 | when [verb] back [prep] | 15 |
|
